Rant because I have to get it off my chest

I'm almost 20 weeks pregnant. I found out,I was pregnant around 5 weeks. And a week later my husband left. He was gone a month and came back. Within that month I became friends with this guy. After my husband came back I had found out he cheated and possibly got another girl pregnant (still do not know if he did). I made him leave this time. He has absolutely nothing to do with me and doesn't worry about how the baby is or anything. And I've found out that he's cheated on me multiple times. Well the new friend from my husbands first leaving, has become more than a friend to me.. I had to push aside all of my trust issues and all, to actually consider this guy a potential. He asks about the baby all the time, and seems to genuinely care.. Well at least I thought. Turns out he's been hiding a fiance from me.. I feel completely devastated, because he knows about everything that has happened with my husband.. I had completely opened myself to him, to again, have the same thing happen to me. I'm trying really hard not to let this bother me, because I know that the baby experiences all of my feelings..