How to forget an ex?

I didn't want to update my questions before, bec I really need help that time.
so it turns out that my ex boyfriend was just messing with my head or I don't know what was his purpose by acting "hot and cold".
my close friend talked to him to see what's happening in his life lately, and she knew that chances he'd get back with me are 0%, so I must move on.
I need advice on how to move on, I know time will heal, but for the time being I need to know how to move on, I'm literally heartbroken :), so anyone can help?
How to forget an ex?
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