The baby's father...

Does or did anyone have a problem with the baby's father? He's physically here in my life & we have 4 months to go in my pregnancy. He's making me feel worthless & that his other child is more important. (He has one with another woman). Hes been drinking almost every night but hasn't been violent or anything. But he will also up & leave. Did anyone else have this issue? How did you cope?