How do I move on?

I'm 18 years old, and I had been in a relationship for a month with a guy I met online. Everything was going well, but yesterday he ghosted me. Yes, it's my fault; I shouldn't have trusted him. People can easily lie on the internet. Maybe he had a girlfriend, I don't know. But anyway, how can I forget him? How can I move on?, I feel so bad..
How do I move on?
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