Advice needed

So I’m pregnant and me and the baby’s father broke up because of his cheating and him not knowing what he wants. I’ve been talking to this guy for awhile now and we seen each other a few times never got to actually have sex, he tried once but i wasn’t really sure i wanted it so he stopped. We supposed to see each other again and i do kinda want to do it with him with protection ofc but i kind of feel like i would be a dirty and horrible person and a bad mom if i did it while pregnant with somebody that’s not the kid’s father. I guess my question is if i’m being right about those thoughts and if somebody was in my position and what did you guys do? Please don’t judge