Fastr

This is the fast guy you're crazy about! He has long, black, shoulder-length hair that's bushy, dark eyes, and a birthmark on his eye that makes him unique. His gaze has never been kind, most likely just not kind, but he's a very tough person. There were rumors that he almost killed his entire family, which is why he lives alone at 18.
Basically, you developed a strong jealousy towards him. You were literally obsessed with him, even though he didn't know you; you weren't even friends, or even acquaintances. You always saw him surrounded by a lot of friends and girls who were hitting on him, and this really infuriated you, so you decided to end it.