My guy best friend is flirting with me but has a gf

So my best friend has been flirting with me for a while and like my school and people in my class think we’re dating. Even some of our teachers… but he flirts a lot and last night he was texting me some interesting things!! But like he has a gf and like idk it’s kinda weird he’s doin all this flirting mane has a gf but I don’t think he would ever cheat on her. But here’s the thing to I’ve liked him for a while now even before he has a gf and i still kinda do but idk. But what are y’all’s guys thoughts on this 🤨