How do you feel about me seeing a guy who is in a relationship already with a pregnant woman?
Why would you want to date someone who is already in a relationship
I never really liked the guy but I also felt the girl he was with wasn't good enough for him. I was hoping he would find someone better.
It's nice that you thought so highly of him but going into a relationship with someone who is already in one is a really bad idea. Now there's all sorts of emotions and complications that need to be resolved just because you did that. I bet this even ruins the relationship with his girlfriend who is now also the mother of his child making it even harder.
I was like okay with it.
Just because you're okay with it doesn't mean that anyone else involved will be. Try to have some empathy and think about how you'd feel if someone dated your boyfriend while you were in love with him.