Sex after cheating... Need advice !!!

So my partner cheated on me I'll save the details... we talked and we are trying to work on the relationship first cause he says he is deeply sorry and he loves me more than anything... secondly because I'm pregnant. We used to have a lot of sex till the day I found out he cheated. I haven't been that horney but I miss human touch I miss hugs kisses the reason I haven't done any of that it's because I'm still In pain like seriously I could be "happy" and the next moment rage! Then sad ! I cry and feel miserable about the situation, even when he is by my side is hard it's weird :( 
My question goes to those who forgive their partners... How did you do to be "normal" again? To feel right? To have sex without having the situación crossing your minds?
HELP!!! 
UPDATE: ok well last night I decided to sleep almost naked just with panties on cause it was really hot at the aparment so he did too... and I think he got horney due to that but I wasn't trying to have sex... long story short I fell asleep and I woke up with him touching me and ready to action and before I could say no! He was already inside of me, I just stayed quiet trying to wake up or stop him I couldn't... and I also started to think about the cheating situation  and the possible way he fucked her... ugh! I hate it so much! I can't enjoy having sex with him anymore 💔. And we haven't kissed since I found out he cheated wich makes the situation even weirder...