My Boyfriend looks at me with total disgust during intercourse and barely touches me anymore. It has gotten worse after the baby... is he cheating?

So I have been with my b f for almost 8 years now and we have 3 kids. I put on 20-30 lbs since our baby was born 2 years ago. Before he used to make comments about how beautiful and sexy I was but right before I got pregnant he started drifting away and now it's like he has totally jumped ship. I have to fight with him to spend time with me and I practically have to bed for sex. We do it maybe once a week and when we do its all about him and thats it. I noticed tonight when we were doing it that he had a look of total disgust on his face. What should I do? I'm desperate to fix this, I love this man to death and I do everything I can for him. Please help!!

My Boyfriend looks at me with total disgust during intercourse and barely touches me anymore. It has gotten worse after the baby... is he cheating?
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