How do I tell him that I think I’m bisexual?

Cheyenne

So I’ve been dating this guy for about 3 years. And I’ve only ever dated guys. Never once has it crossed my mind to try things with a girl. With that being said, I have always been attracted to women too. And lesbian porn is the only porn that turns me on. Recently, I’ve come to the conclusion that I think I’m bisexual but how do I tell my boyfriend? Any help of advice would be great!