Obsessed with his ex.

I'm obsessed with my bfs ex.  I know he doesn't want to be with her and that he loves me, but for some reason I can't stop thinking about her.  They started dating when he was 16 (she was 14.) and stayed together for 7 years.  I know sooo much.  Probably too much. They lost their virginities to each other, traveled to Europe when she was going to school there.  He broke up with her shortly after and she wanted him to stay so he did, then he broke up with her again.  He had a 3 year relationship with another girl after that. He broke it off with that girl and Tgeb hooked up again  with the first when he was 28 and after he met me he wanted me and told her he didn't want to be with her (she cheated on her bf with my bf and broke up with him only to find out that my boyfriend wanted me and not her.). She's a lawyer so it's easy to look her up.  She's perfect.  Literally, perfect teeth, straight hair, manicured nails, dimple cheeks.  Smart. She knows 3 different languages.  I'm not bothered or anything like that.  Idk what it is.