How do I️ fix my relationship?

I️ feel like my boyfriend and my relationship is so hostile and annoyed. For every one good interaction, we have at least ten bad ones. It’s not like a one-time mess up or one fight. It’s like a general sense of annoyance toward the other. Today while at a coffee shop (I️ was working on my dissertation and he was taking care of work items), I️ reached out to grab his hand and he pushed mine away and told me to “knock it off because [he’s] kind of busy.”

We haven’t had sex in over two weeks (which I️ realize for some is normal, but sex is important to me and it feels like a dry spell).

I️ can’t put my finger on what’s wrong, and when I️ try to talk to him about it, he tells me I’m being dramatic or silly or that it’s in my head. But it doesn’t feel like a good, pleasant relationship.

Any help?

Note: We’ve been together almost three years and have lived together for about a year and a half.