My wife is insecure about my ex's friendship with my sister
We all live in Canada, me(35M), my wife(35F) and child(2M), my younger sister(27F) and her husband(28M), and my ex(31F). I brought my ex here after our wedding on spouse visa. My elder sister is married and in India. During the course of my marriage, after finding out that my younger sister wanted to travel and had big dreams, my ex had encouraged our family to send her to Canada to study. My family had never really thought of sending her abroad to study, but since I was here, they let it happen. So my sister is grateful to her. Which I understand. My sister never brings up my ex to my wife or me. My sister also didn't like that I divorced my ex and she's not close to my wife. My sister is polite to her, I won't stand for it otherwise, but her relationship to her is not like that with my ex. They used to go on shopping trips and girls day out and other things, which doesn't happen with my wife. They have hung out in a family setting, with me and my sister's husband, but they really have nothing to talk about.
The reason I divorced her was because I found out she had a past and she lied about it. I have admitted to my wife that I had overreacted on that issue. During that time I was very angry as this person was not someone you think would lie about something like this. She got along with my mother and both of my sisters. My elder sister liked her but she's a bit distant, but my younger sister thought the world of her and didn't change it afterwards either.
Anyways, they are extremely close even now, and my ex calls my mother sometimes to check up on her. My ex's parents were initially not talking to her due to the divorce and they didn't know the past issue, so it was a shock to them. But they do talk now, my mother mentioned it.
My wife keeps checking my sister's social media and sees that my ex and her decorated my ex's new bookshelf or went out for spa day etc. She's paranoid that my family likes my ex more. Which is not unfounded. My ex's family wasn't that affectionate. So she bonded with my mother and younger sister a lot as me and my older sister didn't give hugs often, but she liked it. My wife's family is loving towards her, so she didn't naturally gravitate towards my mother. We don't spend that much time in India. My wife had chosen to spend some time with her family before the visa got approved as she won't be seeing them for some time. Which is fine and we understood. But before my ex came to Canada, after our wedding, she liked my mother a lot, so she had chosen to spend some time with my family, during which they bonded.
Anyways, my wife also knows that my ex had told my mother to support my remarriage as she can't see herself living with me as I'll doubt her again in the future and since I wanted a fresh start, to let me be happy. My mother was hoping that we'll get back together. I had considered it for some time, but she didn't want to. I had to deal with a lot of drama from my sister during that time, saying someone like me didn't deserve her and some other crap. Anyways it worked for the best as now I have a son who's my whole world. My wife is extremely agitated these days as she doesn't like my sister being close to my ex. Ever since she stopped working it has gotten worse. During the initial stages of our marriage, she didn't like how close they were, but it wasn't so bad. Earlier when she was recovering from birth, it was fine as she was focused on herself and we went to India and relatives were fawning over the baby and her. Now she constantly says things like even you had wanted her back but since she didn't want you back, you married me. I do love and care for my wife. My son is two years old now, she doesn't have any ppd or anything. Our plan is for her to start working the next year. Our son goes to day care for a couple of hours now so that she can get some rest and the remaining time she balances well with the toddler and the household. I do cook and clean and take them out on days I'm off. I don't know what to do to make her more secure.
I can't tell my sister to not post stuff on her social media, as she's an adult with an independent family. I can't tell my wife to stop looking, because she's going to get more paranoid.
I have no idea what to do.
Edit : Can we please focus on the issue at hand? I know screwed up with my ex. She's happy now and so am I. My sister loves her because my ex was thr best thing that ever happened to her. My older sister is much older than us so she was never that close. My family helped me settle in Canada. We thought of getting my sister married to an NRI so that she could come here. My ex was against it and said that she needs to travel and see the world before the marriage and made us send her here. She helped pay my sister's fees by mortgaging her gold. She got that back in the divorce along with half of my savings, despite me contributing more to it. She didn't ask for it, I gave it up myself because I didn't want her to struggle due to the divorce. My ex wanted the divorce because I fought with her multiple times. I wish I had gone to counseling then. My ex was a very cheerful person so it was a huge shock to me that she lied and I have regretted it since. I was upfront about trying to remarry my ex with my wife because it was a whole thing with my family discussing with her family. We didn't want my wife's family finding out from someone else. Also my sister has seen how a lot of NRI men treat their household chores as only the wife's duties so she was adamant that she won't be stuck like that. She married a Canadian man. My ex and I convinced the family. It was not that much of an issue anyways because I think my family kind of expected it. We had no more girls to marry off and we are Christian, so there were no issues religion wise either. And lastly please do not insult my wife. She's dealing with a toddler and I have had to pick up more shifts to makeup for our lost income. I love my wife. She's a good person. My ex is a very likeable person. My wife is close to her own family, so she never had that extreme need to bond to someone. She was pampered quite a bit by her family. My ex did not have that. They're all quite cold. For example, if my ex would ask for jalebis and her father would ask her to add it to the grocery list. My mother or father would just go pick it up on the way home from their evening walk and give it to her because she mentioned she likes them. I am not saying that my ex's family is not loving but my family is a bit more loud and expressive. Which she loved. It's not my wife's fault that she already came from a family which supported her. I understand that I was very unfair towards my ex. It was like a month and half of arguments and she decided that she didn't want to put up with it anymore. My ex had bonded with my family during the time she stayed at my house waiting for her spouse visa. My mother is physically affectionate which she liked while her mother is not. My wife on the other hand stayed with her family because she wanted to spend more time with them before leaving. Which we agreed to. She's a completely different person which is not a crime so do not insult her. I don't want to hear a single insult about the mother of my child. My question is about how to make my wife feel more secure. She doesn't want my sister knowing that she feels jealous so I can't discuss it with my sister. I already know that I was unfair towards my ex so I don't need so many people telling me that. Asking my sister to take my wife out for a girl's day won't be very helpful though I'm willing to try that. My sister likes Marvel movies and is obsessed with Harry Potter. My ex was too, so they bonded over that. My wife is not into all that. Completely different personality. She only started feeling this way after she started staying home after our son's birth. If I ask my sister to come and take care of my wife or child at the drop off a hat, she hundred percent would. She's not doing this maliciously as she has no idea my wife feels this way.