I need help and advice plz

So I have been with my SO going on 12 years. He has a 12 year old daughter (she was born 4 months before we started dating.). Together we have a 4year old and 4 month old daughters. He is a great dad. I love him with everything I have. I even stopped associating with some family members because they didn’t agree with a interracial couple or mixed kids.

Recently he has been keeping to himself. So this morning I waited for him to wake up. And asked to talk. Asked what’s up and basically was told he isn’t happy. I asked how. He says sexually. He wants more sex and freakier.

So I try to explain to him I’m tired. I had a c section 4 months ago, went back to work after 6 weeks full time. I take care of the kids every night when I get home and thru out the night because he is either busy with whatever he is doing after work. Or asleep. And if he is around he isn’t really helping. Just playing with the kids. While I’m cooking, cleaning. Showering the kids. Doing hw and then bed.

He told me I don’t do more than him. Like it’s a competition. I’m to the point I’m just yesing him to death or just avoiding him because I’m so mad. And on top of that I have confidence issues. I’m Plus size. And don’t know what he really wants when he says freakier. Advice?