I'm starting to feel kind of depressed..

I'm a first time mom, 33w pregnant and my baby's father left when I was 26w pregnant. I have felt like I really haven't been able to enjoy my pregnancy. He's wanting to come back around but he's a convicted felon (out on parole) and has been clean until when he left and is doing drugs now. He wants to be part of her life and share custody but I don't even want him around her now because of his choices. I don't know what to do.