How do you deal with getting over someone?

so I basically got played... I recently hungout with this guy and we kissed and it was all good. im almost postive we both liked eachother but we were just taking it slow. but now im lost because he's hanging out with this other girl... i see them flirting just like him and i did. i can't stand seeing them together because it makes me so sad. i just need advice on what to do/think
How do you deal with getting over someone?
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