Yeeeeeees think you are on to something there. My sisters partner is a male. Remained friends with my ex and ex’s friends. Same group that play sport together and socialise. It’s like I’m the one to blame for it not working out. He does have a few of his own friends too. I think that’s the core of how I’m feeling, lack of understanding by others. It’s like sometimes my sister’s partner will be real chatty with me and other times is avoiding me. It’s weird and uncomfortable and perhaps he just never really liked me.