Ex boyfriend wont let me move on!?

Im 18 ive met a realy nice lad hes so kind and all the other lads ive been with use me,.i know he wont,.but heres the thing hes my ex boyfriends mate my ex has gotten with almost all my mates! Hes a player i realy realy like this lad are relationship can go far we get on so well we can talk 2 each other about anything,.just my ex keeps texting me saying he wants 2 get back 2 gether and now me and this other lad are getting anoyed!,.what shall i say 2 him next time he asks?,.,is it bad im in love with my ex boyfriends mate?,.thanks