Should i kiss him or should i not?

ok so theres this guy and he is lk totally insainly gorgeous and ive known him for three yrs and we lk flirt a lot i lk reli lk him and idk if he lks me or not but were lk reli good friends and lk ive been waiting for him to ask me out but hes come so close but he nvr has and we hav two cles together and theres only 2 and 1/2 days left of skl and were going to different skls next yr so i am thinking bout on the last day of skl go up to him and kiss him but idk if i should and idk what to say bfor or where i should do it or when or anything . HELP! plz