Pregnancy ruined my relationship.

This pregnancy has seriously ruined my relationship. I was on birth control trying to prevent a child, and here i am 25w along. Pretty much since the day we found out my relationship has been rocky. If i wasnt pregnant I would have left. Me and my SO were together a year and 3 months when we found out we were pregnant. After the initial shock we were happy. And now were both miserable. Im so moody. I know pregnant women have crazy hormones. But its to the point where my blood boils over the stupid things and I snap. And even though I apologize it takes a toll. He has been extremely lazy since ive been pregnant. And has admitted to emotional cheating with other girls. Theres no sex. No dates. No nothing anymore. Im afraid were not going to make it.