My old best friend (now popular jerk)
Called my name in the hallway on the way to my locker (he was with 3 of his Friends) so I gave a half smile and he was like woah? Why'd u smile? And I walked to class with my books shaking my head he called my name a second time and HAD A HUGE SMILE so I called out FRIENDLY NOT FLIRTACIOUS lol I don't know if he heard
Next day
I noticed he was Staring at my best friend and at the end of the day she told me that he bumped into her on purpose like Body 2 Body(she felt intrigued) and I have my eye on someone else.

What? Your writing is crazy. Who had his eye on someone else?
The guy flirted with you one day and your friend the next day.
It means he is a flirt and is looking for anyone who will react to him.

That's what u thought like we've been friends forever and he's never once flirted with me or my friends sincr we are low key and very shy.
Idk my life's a mess.

Well if you've been friends forever, why don't you just ask him what he was doing?