My boyfriend issue with his ex wife?

I feel like my boyfriend is not emotionally detached with his ex wife. They were having problems before due to financial reasons since she wasn’t working. When we got together he would complain about her, the way she talked to him, treated him, stealing his money. I seen text messages so It’s true she was harassing him. I didn’t mind it at first because I understand he felt comfortable to talk to me about anything. But when she finally moved out with the kids and got the money from the house, they’re still having issues and drama. The complaining is always the same reason and doesn’t feel right. Now he complains about her not giving him some money (like she promised). The thing that really gets me thinking is seeing his kids, he always visit his kids as much as he can before she sold the house. But now that she has her own place, she doesn’t want him to know where they live. In order for him to see his kids they need to meet up somewhere, but he hates that idea and says he rather not see them at all. It’s confusing because if it’s really just about the kids that he would accept it and see them, or am I seeing this wrong?

Updates
11 mo
He also texts his daughter bad mouthing about her, how she doesn’t want to give him the address. I don’t know what’s the big deal about not having the address.
My boyfriend issue with his ex wife?
Post Opinion