[ Singles & Dating ] Open Question : major confused! summer crush or long term boyfriend?

me and my current boyfriend dated for a year and a half. but then i left on a youth group mission trip and i got really close with one of my guy friends.so close that i started to like him. this only got worse when on the way home he told me i could sleep on his shoulder for the whole 12 hours. so i did. but i was so confused that when i got back i broke up with my boyfriend for about a month. We eventually got back together and it was all nice until i left again this weekend for a trip up at a cabin with some youth group friends. my guy friend was on that trip and i started to like him again. i wasnt really thinking too much about it until we went tubing and he put his arm around me on the tube and helped me hang on. we've just hung out in the past and hes taken me golfing and just hanging out but i dont really know if hes completely into me.. i guess what i really want to know is if im having these thoughts again about the same guy, should i take a chance and break up with my boyfriend again? or is that a totally bad idea... plus, i hate breaking people's hearts.. please help?