I need advie :)

so my cousin just asked me out and he is wayyyy older than me so of course i said no and im pretty sure thats illegal... but anyways there is this realllllllly HOTTTTTTT! guys thats lives near me named ... (cnat say) but i really like him and i think he has a GF but idk he is super sweet and i dont no what to do we are going to the mvies friday to see hannah montana lol and he comes to my house and hangs out. He asked me to run with him and work out which is an nside joke but i dont know what to do cause i think he likes my friend so please help what do i do?btw im moving so i might not get to see him alot :(

he is so nice i asked if he was in a gang(inside joke again)- and he said no y i was like thank god then he said y and i said i dont wan u or your friends to shoot me and he said hee would never ever let that happened.
Also i told him i wanted to go to his soccer game but they stay at hotels and he said u can come but u can get the bed ill sleep on the floor.