u/Any-Anybody-6449

For context me (27F) and my fiance (27M) Peter have been in a relationship for 5 years and we are madly in love. We have both made sacrifices to support eachother and could not have gotten as far as we have without one another, he is my best friend i feel so lucky to have met him. He proposed six months ago and we have been very very happy.

Because Peter is so wonderful i wasnt surprised when Mark (21M), a friends little cousin, started becoming obsessed with him. Mark doesnt have many friends and is a virgin with some resentment towards women, but our friend is always trying to get him out meeting new people because hes worried about him. Mark asked Peter to go to lunch with him a few times and he went, he invited me one time and Mark said "...why is she here... " i said something like "jeez ill just go die" and laughed it off, i left after a drink and didnt stay for food, it didnt really matter to me but i felt unwelcome.

My fiance kept saying how Mark needs to meet women because hes getting a bit incel-ish so I invited him along to meet some girls i knew from work between like 23-30 years old. We had cocktails it was fun, but the younger girls left pretty early and he seemed bummed. So i have made an effort with Mark, he makes me and my female friends a bit uncomfy but in that way where it might just be because hes a bit scared of women? Ive always made excuses for him.

6 months ago Mark invited us to his birthday, I had plans but Peter asked me to come so i swung by later, i was quite drunk, i made an effort to be fun and engaged but i wanted to just go home and i was hungry. At the end of the night Marks ride had bailed and he was stuck in the city (2am), my fiance asked if he could stay with us and i said sure. When we got home they carried on drinking, i said i was really tired and hungry and was going to order a pizza. They wanted to order food too but were taking ages to choose whilst drinking and chatting so i asked if we could do it seperately. I ordered food ate it and got ready for bed before they chose what to eat.

What i wasnt aware of until recently is that when i went to bed Mark said i wasnt "good wife material" he said the fact that i sorted my own food and left them both hungry showed this. He told my fiance not to marry me and said he could do better!

My fiance said he found this so funny coming from Mark (who has never even been on a date) that he just started laughing, he says when he pulled himself together he said he was very lucky to have me and told Mark he was dead wrong.

My fiance didnt tell me about this. Fast forward a few months later and Mark tells people im abusing my fiance, he says hes been round to our house and i am short and snippy and that i just pretend to me fun and kind when im out. I think this is because when i got home that night i was tired and just wanted to eat and sleep? He says i just take my fiances money and buy food and dont share (??). And that im rude and i bully my fiance.

Im LIVID when i hear this, my fiance tells me about the conversation after Marks birthday because it is related. I am even more mad. My fiance talks to Mark and tells him off, he tells him to apologise to me and stop lying. A few days later Mark messages my fiance with a long paragraph to show me, its sort of an apology but not really, he also has my number and could have texted me directly.

After the apology everyone started being fine with Mark again. Im still mad, i want to never see Mark again, frankly I want to shout at him. We have made an effort with him and hes been harbouring a deep hatred of me that seems to come purely from mysogony. He's been misrepresenting me behind my back.

I told my fiance he's his own man and can see Mark if he wants to but i dont understand why he wants to be his friend. We talked about this for a long time and the upshot is basically: My fiance thinks what Mark is saying is so silly that noone would ever believe it, so its nonconsequential. He thinks Mark is going down a scary online pipeline that tells him everyone (especially women) are out to get him, and he needs real life connections with normal people.

I am upset that my fiance wants to stay friends with him, although i think he is doing it because he is kind, and im angry at my fiance for staying friends with Mark after he told him to break up with me the first time. AIO?

EDIT: I should also mention I have been a shoulder for Mark to cry on several times when hes upset about girls not liking him. I've even left events to sit outside with him and listen, ive always made an effort with him.