Why is my husband such a douche bag?

I'm a stay-at-home mom since January of this year. I've worked all of my adult life and WE decided that when we have kids I'd stay home for the first few years. Times are tough and we're on a tight budget but what choice do we have since daycare costs about $300/week in my area? Anyway, I feel like he's jealous or resents me for getting to be home with the baby even though if given the oppertunity I'm sure he'd chose not to be the main caregiver. He thinks I sit around on my duff all day watching Soaps and treats me like crap or ignores me 70% of the time. Like for instance, this evening he was flipping channels on TV and I saw a commercial for a show I wanted to see so he changes it before I had a chance to see when it's on and I yelled for him to change it back and he freaked out! Called me a fat, f-en, stupid b*tch! WTF? Ok, I didn't have to raise my voice but dear Lord, did he have to be so hateful? Granted, I'm about 20 lbs overweight, I had a baby and am struggling to lose the last 20 out of 50 lbs I gained, but do I deserve to be talked to this way? And then he told me to move my fat ***. Two fat comments within 5 seconds! Not like I was skinny when we met, I was almost the same weight I am now. Anyway, what was my question? Just needed to vent I guess. I can't live like this, what do I do? Lose the weight and cheat on him? Ha.