Gets Mad During Sex?

I need advice. I’m 17 and my bf is 19. We’ve been together 2 and a half years. If my bf and I r in the middle of sex and he gets interrupted he always gets really mad. For example tonight we were having sex and his hands were putting a lot of pressure on me so I went to move them kinda and he snapped and said “fuck u u fucked it up” he also told me last week that I always fuck up sex by interrupting it somehow. He said he got mad cause he was close to finishing and me moving his hand shut him down. He said he was sorry but I always feel like he tries to turn things on me when I get mad at him. He was like “ur always on my case” and stuff like that. I love him. He does treat me well but this makes me question us. Help :(