Worried about hubby

Just before I got pregnant I found out my hubby cheated with a 25 year old (I'm 36). Apart from all the problems we were having I was a little overweight and with a not so great body. This 25 year old is skinny and has a round butt. After I found out I went into a depression and stopped eating so I lost all the extra weight and it shocked me to see that my husband got really close to me and sexually active with me. It shocked me because never before I thought the way I looked played any role at his feelings. Now I am 10 weeks pregnant and put on 3 kg of fat around my belly and he started nagging me about it. Except I feel so sick I can't not eat because it just makes the nausea worse... Any thoughts other than he's a dushbag?