I've been in a relationship for almost 6 months now with my GF. She means a lot to me, and I feel like we've been getting stronger, but I can't brush off the uncomfortable feeling that she's still in touch with her ex. She says that they're just friends and left their relationship on good terms as they fell out of love. But that relationship lasted for over 12 years. I try to keep an open mind about it, but I keep getting constantly reminded about it, and sometimes I feel like she trusts him more than me. I get it that we're still early in our relationship, but I don't feel that this is a normal situation. I didn't know about this early on, but one day I happened to notice her free company bus pass as 'partner', asked her about it, for which she got super defensive. She told me she's in touch with her ex, who ironically shares the same first name as me, there's nothing weird going on, and showed me her chats that I didn’t ask for, but I get the sense that she shares almost everything about us with him, like the time when I first brought her flowers or had this cute date, etc., or if she needed any help. I did notice before that she had his streaming accounts and that she had a joint mortgage on her old home with him, which didn't really bother me. But the fact that he knows about me before I knew about him was kind of a weird feeling to brush off. She said that she's blocking him as she doesn't want anything to come between us. But just recently I became aware that he had contacted her for something to do with the mortgage. For context, she moved to a new flat, and we got kittens together. This was the first time she was leaving to work with the kittens alone, instead of asking me or the damn neighbour who she's made friends with, she asked her ex to pop in to check in on them, as he lives close to her apparently. She makes me sound like I'm the bad guy, saying that she doesn't have a lot of friends to talk to, they've known each other for many years, and he has helped her as a friend in the past through difficult times, and now that they've moved on, etc. If I were to commit to her in the future, I would no way in hell want her ex in our lives. AITAH for thinking this way?