He is driving me mad

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I have a problem and im not sure how to put it simply. I have a SO and we have been together for about 3 years now.

Here is what happened today. I asked my partner for sex. And my SO said they were full because they just finished eating. So i lay in bed waiting for half hour on my phone to pass time. Soon after they lay next to me in bed. I start getting handsy and feeling them up hoping that they would be in the mood, but nothing happens. I continue to use my phone until they tell me we should get gas for my car since i have work tomorrow and i really needed it. We head out and get the gas and as we get home and walk back into the apartment, they ask me whats wrong. So i say i want sex. Suddenly they tell me that they are in pain and they just ate and that they cant do it. Making excuses even though all they asked was what was on my mind. I tell them that i dont understand why everytime they asks me whats wrong they make excuses and defends themself when all i did was answer their question. They start telling me that i dont care about how what they are feeling and that i should be reminded that they feel bad and that i should wait for sex. I say i understand that but im just upset about it. They tell me that i should find a different way to deal with myself being upset and that i bottle it up. I tell them that if i could i would but i havent found a way even though feeling a way isnt a crime. This whole time i have to hear how me being upset is hurting them and that i cant wait. Even though i cant help being upset and i am in deed waiting. After that i just start to loose it and i tell them to stop talking im done and i cant do this anymore.

What should i do?