Man seems to me you just need to draw some boundaries, you get to decide what they are. If you don’t like her being in contact with her exes and she knows that, and, she knows that upsets you obviously because she will lie to you about it what is she saying? She is saying staying in contact is more important than your feelings. I think you need a boundary with that, take her out have a conversation and make it really crystal clear what your issue is and decide what you’re going to do if she doesn’t stop this behavior. That’s your “or what” decision