How to stop these thoughts?

I blocked my first love after being mistreated for some weeks. But a few questions keep popping up in my head: what if she starts dating? what if she doesn't miss me and just moves on as if everything that happened meant nothing? will she ever look back and see that she should have valued me?

these thoughts keep coming up and make me to want to go back, but like I said she treated me badly, she really doesn't deserve me.

How to stop these thoughts?
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