u/NewRelationship_Girl

I, [29F] and my boyfriend [30M] have been dating for about 6 months and things are great. But- he was previously married and although this isn’t a problem for me, she comes up in conversation more than I would like. They were together for quite a while and got divorced about 2 years ago. She no longer lives in our state and they have no contact at all. He was the one to serve papers and knew she wasn’t for him anymore. Fast forward to now. When we’re together I sometimes forget that he was ever married. He seems to have moved on. There are times though when she comes up and it’s so hard to listen to. A lot of it is my own insecurities and overthinking but I’m not sure why she keeps getting brought up and so often. He says it’s because he’s moved in and it’s healthy for him to be able to talk about it openly showing that he’s moved on but I really don’t like it. I’ve mentioned it to him and he apologizes but then itll come up again in a new conversation a week or two later.
He is a really good boyfriend and I know he’s trying. But it’s really hard when she comes up or memories come up from his past that he shares like stories from his bachelor trip.
where can I find some good books/guides that could help me in this situation?