Is his response justified (sexual content)

Earlier today my bf asked me to suck his dick. I said yes but only after I finished what I was in the middle of doing. For context I’ve been feeling nauseous and sick the past couple of days. When I finished up I suddenly felt like I was going to throw up and said that I could not suck his dick at the moment and I needed to lie down. He got quite upset and when I asked why he said that it is upsetting to him when I say yes and then switch my answer to no. He followed that statement with Im allowed to have emotions about being upset and disappointed. His whole demeanour and tone of voice changed from loving when I had said yes to rude when I said no.

Additionally it has become a theme in our relationship for him to continue asking if I want to have sex even after I say no the first time because he knows that I give in.

We live together and have been together for years so please don’t simply say to split because this situation is much more complex than that.