How do I forget thinking about him?

This guy led me on, gave me false hopes until I accepted him.
He made me feel like the most special girl.

Now he stopped calling, texting or even checking on me!

If I text him or call him, he just gives excuses that he's busy but I saw him partying or simply doing nothing many times.

It feels like I don't exist until he needs my company again.

How do I genuinely forget him and lead a mentally normal life?
Apart from blocking, something that can effectively help me move on?
How do I forget thinking about him?
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