Pregnancy and cheating spouses?

Newly married, I found out my fiancé had cheated on me once before we got hitched. But soon after we got married I found out it wasn't once but a couple times with Prostitutes & bar whores! It was devistating and still is because I'm Pregnant & this is our first child "together" we have children from previous marriages. My confidence is completely low and has been for the past 6 months! I'm worried that he's going to cheat while I'm pregnant or even after! I was super confident before I found this all out, being pregnant doesn't seem to help. My question is how can I get that "spark" back in my confidence especially when I'm pregnant. He's been reassuring me he's changed and hasn't cheated since we've been married & has no desire to, blah blah blah! I feel if he did it when I wasn't pregnant and I had a banging body, was pretty much a sex goddess in the bedroom what makes him not want to now that I'm huge and not really into sex!? Will I ever get over the cheating? Is there hope? 
If anyone has ever dealt with something like this any advice is welcomed!