My husband doesn't want sex......

So since my husband and I have gained a little bit a weight he doesn't like how he feels or looks. This is now causing us to have less sex. Now I document every time we have sex because we have been TTC. We would have sex sometimes 2-3 times a week to now 2-3 times a month sometimes not even that. I have tried to get him to work out, diet something but he doesn't want to right now. He's been very depressed over his weight as well.. Now I have gained weight and don't feel great about my body but I still want to make Love to him... I don't know what to do to get him in the mood.... Any suggestions? By the way we are not over weight just a little out of shape...