What should I do?

My ex broke up with me, and then, we (me and him) decided to try and fix our relationship. However, I found out that he was dating another girl. We never agreed on seeing other people in the meantime. He did not tell me about it (him dating while we were trying to fix things), or anything. He also lied about few things. So, I confronted him about it, but, instead, he blamed me for it. Therefore, I decided to cut all ties with him. Now, even though I still love him, I'm trying to move on. But, I feel like I won't get over him. What should I do?
What should I do?
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