My boyfriend and I have been together since December 2015. Literally ever since we've been together his baby momma has been interfering with our lives. She will not allow him to see his daughter while he is dating me. She was living with his mother(she has no immediate family) that way they could take care of the child together(child had problems right after birth). He starts dating me and moves into my house. It's a good 45 minute drive to his moms so he would visit every weekend. She got mad one day, picked up and left to a friend of her's house. Now she refuses to let him see his child. She constantly sends him threatening messages, tells him he is a deadbeat father, disrespects me, and plenty of other derogatory comments. We broke up for a month, and just recently got back together(she doesn't know). She keeps sending him messages and blowing up his phone telling him until he blocks my Facebook and stops speaking to me, he will never see his child. Has even resorted to messaging ME. We blocked her from our social media, but obviously he can't block her from his phone because he needs to be able to get a hold of her to see his child. I live with him at his mothers now, and she blows up the house phone if he doesn't respond to her negative messages. Has brainwashed his mother into thinking that their child is constantly having problems, and needs extensive medical care(all the while sending messages and pictures to my boyfriend of how great their daughter is doing and "missing out on")I've reached my breaking point. I don't know what to do without jeopardizing his relationship with his child.