Someone tell me if couples therapy is worth it in a young relationship (3months) w/ communication issues?

My bf does not know how to appease or control his ex. Actually what worries me is how fresh their breakup is. It's a bad breakup. She took his daughter to Texas and left him in Cali and she basically cheated and crushed him. I told him in the beginning I could deal with him having a baby, but not with her calling all hours of the night or early morning when I'm with him. PLUS their divorce is not final. We have fallen hard for each other these past few month, but I am jealous that his ex still gets a rise and satisfaction out of messing with his head using the baby AND that it interrupts our time. HE thinks I should just put my feelings to the side about her for now since we both can't control her actions but it's starting to mess with my head on whether he can follow through with the divorce or keeping her at bay and now we fight everytime she calls. He says I'm tripping. I say make a change somehow to respect me when we're together. We're verging on getting nasty with each other now. like we're turning into each other's ex's.. will therapy help us communicate our fears or what else? Seems like not communicating our past traumas and getting defensive is our weakness. Any other chances besides just leaving him?