Is he gay?

So I have questioned my fiancé a couple times about this and he says he isn't. Anyways his dad is gay and didn't come out until he was in his 40s. My fiancé never wants to have sex but I know for a fact he masterbates. Anyways yesterday he was playing a game and I looked at the chat and he asked this boy if he was gay he must of said no and he said me either just wondering. I questioned him about it he said he was hitting on me did you see the rest which it wouldn't let me go back any further. I know my fiancé he would flip out if a guy was hitting on him. So I accused him of it and he was like I'll show you how gay I am and he threw me on the bed and ripped my pants off. I just don't know what to think. He always tells me guys hit on him and he is all about looking good and his appearance. What do you think? I don't want to be like his mom and be married and have 3 kids and then come out your gay at the age of 43