How to move on for someone I like?


I have been in love with someone for long time about 4 years. So I told him that I like him and he rejected me so we keep in touch only on Snapchat. I told myself maybe one day he would love me. In the end he send me a snap a video he slept with bitch yesterday. I got shocked. I can’t believe what I saw. He told me that I always sleeping with bitches. I hated myself. I want to move on but I can’t. I don’t know what should I do ! I can’t even delete him on Snapchat.
sorry for my bad English;(

I need help how can I forget him ! ;(
How to move on for someone I like?
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