What do I call it?

My relationship seems like a rollercoaster and I have a hard time describing the things that drive me crazy. Also AITA?

It's in the afternoon. I had just turned a movie on in the living room while he was at the dining room table. He left the table walked by me and said he was going to sleep. I kept watching the movie. A little while later I went to the room. As I went into the room he left immediately, upset because I hadn't followed him in there in the first place. I told him he can't get mad at me for not doing something he never told me he wanted me to do. I let it go awhile later came out and got back on the couch in the living room. He then asked what I needed. And I said nothing. Then he asked why I was out in the living room again. And I said to be around him, thinking that would make him happy. No. Then we sat in complete silence for at least 30minutes until his son came out of his room. Then he proceeded to only speak to his son, make plans to go to the store, and then leave taking my car without saying anything to me.

Earlier he had agreed to take me to the store to get cupcake mix. Well he went with his son and gave me funfetti donut mix. Then wanted me to be happy because he got something I never wanted. He did the same thing a few days ago when he brought home shampoo I never use and not the kind I've been using for the past year. I still said thank you for it. But the problem was I didn't say it as grand as he wanted me to.

I don't feel like I'm being an asshole. I feel like I put up with a lot so I know I harbour a great deal of resentment. But after everything's built up over time could I be blowing these things out of proportion now and that makes me an asshole? I just can not wrap my head around the chain of events that occur.

Are you jealous because I wanted to watch a movie? That's completely illogical to me but does it make sense to him? Did you want to have sex with me and by telling me you were going to sleep I was somehow supposed to know you wanted to have sex with me? Also since we've been on a downward slope I really don't want to have sex. But if I say anything about not wanting sex it's like he's offended and I've hurt his feelings. Which is one of the reasons I don't want to have sex with him. Because now it feels like a chore. I take no pleasure in it.

Any enlightenment or advice is Welcomed.