GUYSS help me out .....relationship stuff..please?!

why would a hot guy(like mr.popular) cry over you?---->when u turned him down be really protective over you and want to damage you if u ever cheated on him of dare flirted with any other guy....wanting to give u sex to be with u....literally watching u with love in ones eyes...and get devasted like running behind u to confront u (more like hit...p.s. a girl held him back)when i said i had the biggest crush on his best friend who i thought was the hottest guy in my classes....and dissaprove of my flirty behaviour and my clothing btw i was ms.popular not cocky bout it though.....like i cant think of him as creepy though cause he was hot but doents he sound a little crazy or was he in love?...come on u tell me guys