So I have a sister who is 6 weeks pregnant & she always tells me that her bf is always bringing up his ex him & his ex were together for 3 years but she cheated on him with his own cousin for 7 months. She tells me that he says he has to many memories with her That he can't let go they do have a daughter together, but they are always talking I get they need to talk bc of they're daughter but I know that's not what they always talk about. My sister is confused on what to do and I want to give her advice but I've never been in a situation like that? Can someone give me some advice so I can tell her please?