How do I make my boyfriend (16M) trust me (16F) if he thinks I would cheat on him?
Me and my boyfriend have been on and off again for around a year and a half. For background, his girlfriend before me gave him a lot of insecurities relating to toxicity and infidelity. Ever since her he has felt as though he would always be cheated on. He has never explicitly told me that she cheated on him but he has told me he has been cheated on in the past. I have no idea how many past relationships he has had or if the cheating was recently which might affect his perspective on the situation of now I need advice on. One of our biggest arguments we had which almost caused us to break up for the third time was because he thought I was cheating on him with other guys. We had a mutual friend, who I knew liked him, in common (he didn’t know this at the time) who told him I was. I wasn’t and I proved to him I wasn’t by showing him my texting logs, which obviously showed no sign of me texting any guys as I only have one guy friend (We both are friends with) anyways. We talked everything out and fixed the issue.
Around 6 months later, now, I noticed my messages weren’t going through to him for a whole week while he was active everywhere else. Eventually, he texted me and he admitted to me he had suddenly blocked me because of reposts I had on Instagram. He claimed these reposts were of people I was attracted to (they were edits of my favorite tv shows) and that I had left inappropriate comments saying things like, “loml,” and so on. Now, I do remember my reposts obviously but I don’t remember commenting anything of the sort. I even went through all my reposts and I didn’t see any comments, but I know he wouldn’t lie. So, I assume maybe they were old reposts I might’ve gotten rid of way earlier in our relationship (?). However, I know for a fact I do not find any of these people attractive and was purely just engaging in fandom. I told him this, while obviously addressing and understanding his concern, but he doesn’t believe me and I don’t blame him due to the issues he’s had in the past. He says no matter what, I disrespected him, which I can see now, and would cheat on him.
So, now I’m just left with how can I, moving on, build trust between us because he says he doesn’t trust me or anything I say anymore. He almost broke up with me again and although I don’t exactly know what I said or did, I think his feelings come from a valid place. I want to build our relationship again. What can I do to build trust again and show wouldn’t cheat on him?