Unrequited love song: so theres this guy who i really like but loves another person... he professes he really?

likes me too but he wont cheat... i like him a lot too but i definitely dont wanna be the antogonist in their story so ill just let him go and now im just deeply saddened.. he told me that if he was single he'd date me. aside from a good song what would you guys advice me.... its the first time ive cried over a guy lol