Hi I'm 18 years old my boy friend is 20 we have been together for almost 3 years and its been about a year that we haven't had much sex, I cheated on him before and I also gained about 20 pounds, he always wants to have sex like before since we would have sex almosy daily but now I NEVER want to. Its probably once or twice a month that we have sex. I want ot have sex with him but I don't know why I feel like I shouldn't? I really need help!