Ladies, men! I need help.

A friend of mine is having a baby. His ex-girlfriend is about 16 weeks pregnant.  The reason they broke up is because they were always fighting and at one point of the relationship it was kind of abusive. When I became pregnant , she announced that they were going to try for a baby so she is about 5 weeks behind me. Last year she had an abortion in September because she didn't want a baby with him. NOW! My friend has broken up with her and she is threatening him saying she will make sure he never sees his child unless he gets back with her. What advice do you have for me to give him? I said he should talk to her mom and let her know of the situation & talk to a lawyer.  The main reason for her getting pregnant is to "trap" him. They are both 20 YEARS old so they are to grown to be doing this dumb shit to each other. MY SO told me to stay out of it but I can't believe a female would do this to her child. It's so disgusting to me.