Getting flustered and upset thinking what to do?

i'v know this guy since i was little (our dads are mates) and we used to go to footie matched together and stuff .we met again (hadnt seen him in a while) we where really close and told each other everything, i even fell for him. but this year he got a girlfriend wich to be honest didnt bother me i mean id rather have him as a friend then tell him i like him and it be all awkward. we were close but not as close.but she left him and we were close again. he worked his way through loads of girls withing weeks witch annoyed me. but recently he went out with my mate. after 3 days he lost all interested in her and started flirting with this other girl...so she left him and withing 5 mins he was asking the other girl out. we arnt really talking much and i found that heartless and cold, since she really did like him. i really do like him, but i hate him to,soo much.but an hour ago i was talking to him on facebook and i was upset (personal reasons) and he said... you ok? so i said no, his response to this was ...can you upload those photos later i need a new profile picture.... i was soo annoyed at him, iv always been there for him, always!! anything to make him feel better id do. i dont know wether to just let him go off and forget him or try and stay friends.i want to just cry so much.!!!