i have a problem..., friends ex off limits? Options

[amyxhartman]

ok my friend dated this kid ryan a couple months ago. they only went out for one month, and we're only 15 so it def wasnt anything serious, plus at the time i also had a boyfriend. now since then, my friend has gotten with 2 other guys, including one of ryan, her ex's, best friends...but still remains friends with ryan. lately, ryan and i have been alot closer, i really consider him one of my best guy friends. he always hints that he would like to be more than friends with me, just casual flirting and such, and i admit i do flirt back. but would it be wrong for me to hook up with him? i'm kind of afraid my other friends will think thats unclassy (i admit, i probably would if it were someone else)... but i do really like him. can someone please give me an outside perspective, because im hesitant to take this issue to a friend (all my friends are really gossipy lol) thanx u so0o0o much!!