Confused

In dec i had a miscarriage. I got pregnant again and found out april 18. A week latet my fiance, my daughter, dog and myself moved to our own place, no roommates. Since then we have done nothing but fight. He knew my ex would be in the picture, i told him when we first got together that my ex and i are working on being friends and co parents. Since we moved my fiance has flipped out multiple times saying that my ex is only involved with my daughter to get me back. My fiancee works with me so he sees me on breaks and lunch and we ride together to and from work. Last night he told me that im cheating on him with my ex and the coworker we give a ride to. When i asked him when, all he could tell was when he sleeps which is in the car to or from work and after i go to bed. Last night i told him to get over his issues with my ex and stop making me pay for what his ex did to him and he told me to stop breathing. For the last 2 weeks he has said things that i feel are uncalled for such as. I thought you were smarter than that, park farther away from that, you meed more clearance than regular people. and then when my daughter asked for clarification on something he said, he told her that she is as smart as a brick.