Fiancé suddenly has a fat fetish and our sex life is dead

I feel like I won’t find ANYONE who can relate to this situation but I’m just so lost. We’ve been together 6 years. When we met I was very skinny. Our sex life was amazing, honestly it was every day or every second day. We fell pregnant pretty fast and had our first child.

Fast forward to now supposedly ‘TTC #2’, I’ve gained a bit of weight and we have ACTUAL penis in vagina sex once every 2 months, If I’m lucky. I discovered him watching porn of overly obese women stuffing themselves with food. Now the only way he gets off is if he’s playing with my stomach rolls and I’m giving him a handjob. I’m not even kidding. I wish I was trolling. But I am being 100% honest. I HATE how much weight I’ve gained but he seems to love it. I’m miserable and don’t know what to do. Real sex doesn’t even get him excited anymore. Is it over? Do I give up? I cannot keep living like this. I haven’t had dick inside me in over 2 months. I love him but fuck me.. (literally) 😩