Sexless marriage, porn addiction and lies and 8 months pregnant

So there are many layers to this situation but I'll give you the short. 
Husband hasn't been able to get or keep an erection with me since we got married a year and a half ago. (We've had an ok sex life for last 6 years). I hate my small boobs and have been extremely insecure about them my whole life. I had sex with one person (if you can call missionary for 5 min under the covers in the dark once sex) and let's just say he's been around the block since an early age. The last girl he fucked before me was brunette and had huge tits and I have been in therapy trying to get past the image. Then he says for months that he can't wait til I'm pregnant because it's gonna be so hot. 
I got pregnant (no idea how since we never had sex ever) and the whole time he's said I'm pretty blah blah but won't come near me with a ten inch pole. I've begged for intimacy and he refuses. I've asked him to get his levels checked...refuses. But the kicker is I find a bunch of naked photos of girls who look exactly like the last girl on his computer and catch him getting off to big tit porn for months while I cry in my bed and battle severe depression. 
I kicked him out and I'm filing for divorce and he wants me to give him a chance....I've asked for change and given him a million chances this last year and now that I'm 8 months pregnant he claims he wants to change.
Now I don't see the point. If he wasn't attracted to my body before or during pregnancy or what he considers small boobs (34b) and he can only get hard from gigantic ones...what makes me more attractive now?! My boobs have stretch marks and are completely disgusting now. I'm gonna have a nasty stomach now where before I was very thin and lean (5'3" 115lbs). And we will have a baby and no time or energy for counseling or intimacy. 
I threw up yesterday just thinking about him touching me. He's only sorry he got caught for the tenth time doing this. 
I can't stop crying and hating my body. And now I'm resenting my unborn child. Any advice?!