How do you get over a relationship?

I was with someone who was obsessed with his ex, had me buying him things and after we finished he was with someone less than a week later. Logically i shouldn't feel so bad, he's broke, bad with money, smokes weed all day and obviously didn't care about me.
I've blocked him but I don't want him to forget me, I don't understand why I'm so hung up on him when I write all this down I know I deserve better. I just feel so worthless.
what do you do to cheer yourself up after a breakup?
How do you get over a relationship?
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