We've been together for 6 months. I'm 18 he's 17. We went on a break because I didn't know if I was still feeling our relationship. During the break I looked through his phone & found he was texting other females the same shit he texts me since the beginning. He stopped a few months in but then continued 5 months in. We didn't have sex until the end of the relationship at about the time we went on the break. Was I too harsh to break up with him for that?