Her weight gain has killed our marriage

I'll start from the beginning, as that sounds fairly logical. When we started dating, she was about 165 at 5'6". She was gorgeous. Yes, she could have stood to lose a little bit of weight, but I didn't care. She looked great. We had sex like rabbits. She helped me through my cancer surgery, and I knew she was the one. Five months after we met, I proposed. She pledged then and there to lose weight for the wedding, but did the opposite. She gained about 10 pounds. I didn't think it was anything, really, just maybe needed some help with her dieting. After the wedding, she tried diet after diet, and I dieted with her. I lost weight, she gained. It seemed that no matter how much dieting and exercise we did, she couldn't lose weight. Instead, she gained. Fast forward 6 months later, and she was now 190 pounds. Consciously, or unconsciously, I was neglecting her. She didn't feel wanted. She met a guy at a party who gave her that satisfaction and she cheated on me. I did some soul-searching, and I forgave her, because I do truly love this girl. Fast forward to today. She is now 210 pounds. Her weight is completely out of control. I can't hardly recognize her from the girl that I first met. She still has an every-day kind of sex drive, and mine is shot. I am 100% not attracted to her. I feel like shutting my eyes and wishing it was over any time I actually give in to her and have sex. I used to love her kisses when she would give tongue, etc, and now I find it repulsive. I wish I didn't, so bad I wish I was attracted to her again. She's like my best friend. The worst part is that she's trying so hard. She has been dieting and exercising since we got married, we keep zero junk food in the house. And yet she still gains. We don't have enough money for her to see a specialist for possible medical reasons. We tried that route, and after several tests on thyroid, etc, everything came back normal. She passed eve ry blood testing with flying colors. She's really starting to notice how much I despise the way she looks, and it's killing her. She has zero self esteem. I don't know what to do, and my marriage won't last another year like this. I'm surrounded by sexy, tight bodied college girls every day and the temptation is killing me...but I don't want to do that to her. She's in bed right now, probably cried herself to sleep because this is the fourth day in a row that I've turned down sex. We're very open in communication, and I've addressed her weight with her several times, and it just makes her sad. Her self esteem keeps going down the toilet any time I address her weight. Sorry for the wall of text, but I really don't know what to do.

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