Help a girl out

Okay so I broke up with my boyfriend of three years a month ago it wasn't going great and we needed time apart, I met another guy and he was so nice and caring and we both like each other a lot, but I always found that I missed my ex a good bit and then me and my ex kissed when we went to meet up and talk things over and were kind of back together but now I miss the other guy even more and I wanna be back with him but don't wanna hurt my ex. What the hell do I do :(