Baby mama drama

My boyfriend found out he has a son when the baby was 6 months his sons mother never told him about the child. She has been causing problems ever since calling my phone texting trying to be with him keeping his son away from him simply using him to watch him as a babysitter when she needs him to. They also have a lot of drama between them and it's starting to affect me. I find myself being upset irritated annoyed and just sad about everything. I don't know how to tell him to be stronger as a man and now a dad when it comes to her and with us without making him feel like he's less than a man or not doing things right. I also dont want to get involved in their drama i have nothing to so with What should I do?