20 and pregnant

I'm 20 the fathers 21 . I haven't spoke to him in weeks . I've been trying to get a hold of him but he's phone is disconnected . He texts me through twitter but the girl he's talking to rn doesn't let him talk to me . I want to have a sit down convo with him but idk how when I have that girl in the way . There was plenty of times when we were suppose to meet up but she found out . Should I try and talk to her to tell her to back off .