He told me that he never cared about me and just used me, and also has cheated since the day we met. Is what he did really that bad, or is it common and I'm exaggerating?

So,first of all. I'm sixteen, my ex boyfriend is seventeen. We broke up two months ago and I still think about him everyday and would probably take him back if he ever wanted it (not that he does.) anyways, we met last June and a month later were official, he was great. Then in February, we broke up. I dumped him accidentally, and seven weeks later he finally wanted back together because I met someone else. We dated again for seven weeks. Wanna know how we 'broke up'? He ditched me all weekend, then stopped returning calls or texts. Flat out ignored me. His friend texted me and I asked what was up, he said we had broken up and that he been hanging out with some other girl a lot. I called my ex and some girl answered. A week later he began to tell me that he never cared about me and just used me and also has cheated since the day we met.
He told me that he never cared about me and just used me, and also has cheated since the day we met. Is what he did really that bad, or is it common and I'm exaggerating?
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