Gained weight and my wife is repulsed...?

I met my wife when I was about 22 and in shape. I used to skateboard until I got hurt and never got back into sports even though I have asked her to do active things with me, she just never wanted to. Fast foward 5 yrs, 2 kids, and desks jobs later, I have slowely gained 100 lbs. I am a great father, and do the best to be a great husband, but I feel like she is repulsed by me. is obsolete, even though she was never really that outgoing or open ually. I dont blame her for feeling the way she does, but I never expected her to act like she stopped loving me. She acts like she doesnt care about me at all, and she finally admitted that she is like this because of my weight. I want to lose weight for myself and my kids, but Im starting to feel that I will so recentful when I do, that I wont want her anymore. I go out of my way for her, but she seems to go out of her way not to do anything for me, not ually (obsolete,remember) just in general. How am I supposed to feel?