Boy problems (please help)

I like this guy but i don’t think he actually likes me back. I’m 16 and he’s 17 and we’re in this 6 week long camp right now. In the beginning, he was talking to one of my friends who is also at the same camp but she broke it off with him because she felt like he’d be better with one of my other friends who he was hanging out with a lot. Now recently, he’s been hanging out with me and flirting with me and he left my friend’s group (the one he was hanging out with) to be with me and ride the rides together. Then suddenly, another girl comes into the picture and he acts like he doesn’t even know me anymore. I feel like everything will change now because the girl and my friend aren’t going to be at camp for the next 3 weeks. But, what if another girl that’s prettier than me comes during the next 3 weeks. I really like him, but i’m tired of him playing with my feelings.