I(23f) havent told my dad that ive been dating my bf for almost two years now. My grandma really wants me to tell him but im scared

I(23f) havent told my dad that ive been dating my bf for almost two years now

My dad already put a lot of stress on this relationship to the point where we actually broke up for 6 months. We ended up getting back together because we have a good relationship. I dont really want to give details on that but when i first introduced my bf to my dad, afterwards he said my bf is ugly and short. My dad was also mad that my bf was asking “stupid questions” trying to get to know my dad, like asking what his favorite movie is, etc.

Everytime my bf came over my dad would get mad that we go to eat out or that we lock ourselves in my room (its so awkward with my dad and bf being around each other because the mean things he said) to the point where my bf stopped coming over.

So this took a huge toll on our relationship. We broke up. Reconnected and kept hanging out then eventually made it official. My dads past behavior made me really want to not tell him. He would even diss me saying i only like him because hes giving me attention. Its been almost two years of me keeping this secret. My parents are divorced so i just say i hangout with her.

I want to tell him. Its making me feel really guilty. I just want to move out so i can do what i want without making him mad and being trapped in the same house as him. Idk what to do. Im scared my grandma will tell him. He also is really into christianity lately and im scared of his reaction since he will probably say i will go to hell for lying. Please help me