Seriously attracted to my bestfriend....

He's just so attractive guys. He's so damn beautiful and has a glowy personality behind him. He has a big fluffy Afro he wears in a ponytail. He works and goes to school. He's caramel and has these chincked eyes that just make you melt like chocolate on a hot marshmallow. His sign is Leo, and I call his afro a "Mane" to match his sign as well as his royal-like personality. Lol. Him and I have known each other for 4 years but he has a girlfriend. I refuse to disrespect who he's with and their relationship all together, but how do I go about my feelings? I refuse to be a home wrecker and I definitely refuse to try anything that's even slightly out of line. Anyone else in this boat? I'm not being inappropriate towards him, I just don't know how to carry these feelings. Any advice (other than just move on. That's the obvious one lol)