Runaway dad

Hi. Im 7 months pregnant and the father of my unborn child suddenly started acted weird, he stopped contributing to medical bills and stopped attending doctor's visits. He also stopped visiting and helping me around the house. I found out he is sleeping with my gay friend who gives him money because he works a minimum wage job. I haven't heard from him in almost a month now, he's not at his house and when I tried calling the other day I couldn't reach him, I think he changed his number.

I don't know what to do, I feel like he might pitch after the baby is born, would it be wrong to ask him to stay out of our lives IF he does make an appearance?