How do I move on from someone I loved so much?

We have been broken up for 3 weeks now and yet I can't handle it. I'm dying inside. I'm crying and hurting. I want to call him so bad but I know I shouldn't. I'm tired of this pain and at the same time I know I shouldn't go back cause I was treated awfully at some point. What do I do I need help pls😭😭?
How do I move on from someone I loved so much?
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