A guy i used to love but i brushed off keeps reappearing (mysterious behavior, maybe he likes me?) what do i d

i really liked him about 2 years ago, but he flirted with my best friend A LOT and so when he started flirting with me i gave him the whole let's just be friends speech, and he said ok fine that's cool, etc. And promptly fell off the face of the earth. Suddenly he's back (and better than ever :-/) he was really excited to see me, was flirting, and told me i looked beautiful. i still like him. But this is weird and i don't know what to do... Please help!