That sounds terrible, all of it sounds terribly terrible.
Except the part where you're preggerz.
That's beautiful of course
Back to the terrible awful... Why did you two decide to get back together?
The cheating, the lying, the standing you up, the being caught red handed and being nicer to the side dish than your main course, the never apologizing... All of it sounds terrible and I can't for the life of me imagine why you would CHOOSE to try again, especially whilst pregnant.
I agree with EM, you need some down time, but sounds like your life is filled with wayyyy too much turmoil for that to be a feasible option.
Thinking of you