I sometimes tell my boyfriend I'm going to sleep so I can watch youtube uninterrupted
Why would you lie to your boyfriend like that?
I like to watch gay porn, I feel like its cheating on him.
It is normal to want to watch private things alone. You should not lie to your partner because you might get caught.
I can't help it. I will stop for now but I won't promise I wont do it again.
You really should consider neve lying to him again. Telling the truth is the key to a long-lasting relationship.