Girlfriend is attending so many summer camps. It's irritating me.

I’ve been with my girlfriend for a year now. We talk every day and are very close, but over the summer we don’t get to talk much because she is so busy attending summer camps. Every other week it’s another camp retreat. But that’s not even what bothers me, though. These are Christian camps and she is meeting all these guys who are getting her number on grounds of wanting to talk “jesus” and “keep in touch”; although I know they want otherwise from the stories I’ve heard and the things that’ve happened. She spends the majority of her time meeting new guy friends and getting all “buddy buddy” with them at camp and comes back with more guys texting and calling her than before. I’m getting sick of her spending so much time with (and talking on the phone to) these new guys all summer. Yeah, I know she comes back to me once the camps finish but it’s hard on me because she is just too friendly and close with them. How do I deal with the mental pressure of knowing she is spending her days at camp on the beach or playing games with other guys, and her nights sharing the same hotels with them? (Not the same room, but the girls sneak out to be with the guys at night) It’s getting to me.