Most Helpful Girl
Yeah leave. He's being disrespectful, because this girl is being a bitch towards you without any apparent reason and he doesn't do anything to prevent that. Which is his role because she's his ex (who he should have stopped talking to after they broke up)
It's a messed up situation he's putting u in
Most Helpful Guy
If it bothers you that he talks to her and if your not happy with him then you should leave. Stay if your happy and if you can tolerate and accept he is going to keep talking to her.