Breaking up during pregnancy

Im already freaking out about the break up but now ive dropped 20lbs. Im 26 weeks, I feel so guilty for my baby. Super nauseous all the time. I cant stop cryin and either upset or pissed off the whole time. Ive gone to the drs and got put on some anxiety stuff...going onto 3rd week and i still feel like im going to snap. Ive broken some stuff, yelled screamed. Caught him sexting someone and so much more. He was still getting sex from me but i clearly wasnt enough. 4 years 2 kids one due in Oct. Siiigh engaged last month. I was already a little self conscious and now i just feel ugly, broken.

This much stress can't be good for the baby. I just want to stop crying, eat ok and try figure out what the hell im doing now.