Break Up Help?

Basically, I recently realized I’m aromantic (meaning I don’t feel romantic feelings but I still feel sexual attraction) but my issue is I’m in a relationship. I’ve never been happy dating people there’s just always something I never enjoyed and now I finally realized why. I’m still a teen, almost “technically” an adult though (I cringed typing that). We’ve been dating a year and almost 6 months and he’s helped me through so so so much. My family fell apart and I relied heavily on him for emotional support, he’s even giving me and my mom furniture for when we move. I’d be fine just playing along happily just so I wouldn’t hurt him but it’s not a good relationship. He’s extremely controlling and forces a lot of stuff on me that I don’t want and don’t wanna do. So I want to break up but I don’t know how to do it and know especially if I tell him the thing that made me realize it is figuring out that I’m aromantic will make him very very angry as he is against lgbt stuff I just.. need advice or someone to talk to if anyone is willing?