Will I be happy if I choose to be gay forever?

Common question but a very different situation. Help! I take the bus from house to school everyday, and there's this wonderful boy who gets in the bus everyday too. His name is August. My cousin knows him because they're classmates. I'm bisexual and I'm 18 while August is 17. I know I'll end up with nothing but heartache but I can't help it. I started listening to Taylor Swift songs for heaven's sake. Her songs are so awesome like Invisible and Stay Beautiful. I don't expect too much but my heart flutters like a runaway wild horse every time he gets in. I don't know what to do! How do I stop myself? Of course, this happens only in my little bisexual world. I'm still inside the closet, and nobody ever doubts I'm bisexual(except for my parent's of course, maybe). Would I continue marrying him in my dreams...or shatter my fantasy and face reality? Can gay marriage give you true love and affection? Will I be happy if I choose to be gay forever? I've had three ex girlfriends, had sex with them, and neither of them ever knew I'm Born This Way. Please, I need your help. Thanks.