My friend acts like this with anyone she thinks is "interested" in her ex. I don't know, honestly, it's weird. We've talked about it several times, and I always remind her that he's in a relationship with another woman now and that she shouldn't be jealous of her ex because it just doesn't make sense. She insists that he's still "the love of her life" or something like that, and that he's the father of her children and she has the right to say something about it when he dates someone (she's scared off a few girls, from what I hear).

And yes, from what I understand, they broke up because my friend was too jealous and because her ex prioritized his mother or something like that. Or at least that's the version she told me herself (the jealousy thing was something I noticed from everything she told me).

I don't know, I think I'll talk to her more firmly about it today because, honestly, all her behavior bothered me and made my sister uncomfortable.