My fiance cheated on me

I was pregnant when my fiance cheated on me...then he stopped and I regained trust for him...then I started to have dreams recently it was just a voice no faces or anything in the dream say he is cheating that's why he is acting the way he is acting...crazy right I know. So I noticed he turns his phone off at night his call history looks the same way it did 2weeks ago(I have photographic memory) inbox and outbox empty. I really want to marry him and have more children...I pray every millisecond that he changes but I sometimes give up...I need advice I know relationships aren't easy and this is my first relationship. I'm losing sleep my hair falling out my chest tightens. I don't know what to do. I'm under so much stress right now having a 2month old and having to get back to work 3 weeks after having the baby and my job writing me up for every little thing. Everything is falling apart and don't understand why.