Sick to my stomach..

So my husband and I have been together for 5 years. Our relationship has never been perfect, we have our problems just like everyone else, but lately things have gotten worse.

We have a 16 month old child and another due in August. Between being a full time mommy and 34 weeks pregnant, I don't have the energy for sex. My husband constantly wants it, and I'm big and uncomfortable and just not in the mood for it. I still please him with hand jobs and oral, but I don't want intercourse.

Last night, he got a text from some odd phone number and my curiosity got the best of me.. He has been texting some chick he met off some dating site..

We got into a huge fight, his fucking excuse?! Oh I don't give him sex, and porn just doesn't do it for him. So this chick has been sending him dirty videos and pictures and he gets off to it. I feel sick to my stomach. I don't know if I want to cry or rip his dick off and shove it down his throat.

I have since left, with my daughter, and we are staying with my mother. I seriously don't think I can go on with this marriage. Who knows if this is the first time? What would you ladies do? I have so many emotions and I'm just not thinking straigbt.