<human>: So basically my girlfriend [F20] and I [M20] have been together 2+ years. When we started kinda long distance and I wasn't in the best of shape but she was great. Later on though she gained more claiming it was stressing over me not being there while other guys were coming at her. And i was just starting out in college. Now we're at the same school and besides other issues from time to time we are doing pretty well. The thing is that sometimes we try to have sex and she'll complain about my weight specifically my chest and shut down. Its getting better cause i try to hit the gym often but shes not nearly what she used to be either. I'm always saying we should try new things to spice it up. The other night was long passionate and great, but the last time we didnt make it anywhere. Shes so self concious but blames me for most of her problems, an says thats why she has such lazy sex.

Can you condense the text into three sentences or less?
<bot>: we're both outta shape but she says that its my fault the sex life is too up and down. What should I do?