Yeah he is a collector ..... dont be added to his collection
I fail to the logic in one person liking you while he is with someone else. By the way darlin......whats he doing kissing you on the cheek when hes got a girlfriend? If anything you should be annoyed not smitten. Let me give you this advice so you dont have to wonder or ponder....If he liked you he would dump his girlfriend and ask you out. Simple as that.
Children shouldn't play grown up. Things you decide now gives you a hint of the kind of adult you will become. Make the right choice and stick with getting an education and don't get involved in relationships. What he is doing with you he can do against you just like he is with this other child.
The real thing is he just wants to play around. He is not that just into you. Do not give your heart to him he is not worthy. If the girlfriend annoyed you, then play his games. Give them a lesson but be careful with your heart.
This may not be the "best" advice, but heck, you're young... have fun. What's wrong with being a female pla<x>yer.. It's whatever you want out of this guy that should direct you. If it's just a warm body to cuddle up to in bed, as long as you're careful, play him right back! BUT... If you're really looking for "The One", it sounds like you reeeeally need to look elsewhere. He'll only dis you like he's dissin' her right now. Would YOU want to be humiliated like SHE is being right now? That could be YOU after he's "nailed you" for lack of a better term. Just put your priorities in place, think about what you "want" from him, and go from there. Don't follow your heart or a fantasy. Use your head with this guy. Good luck.