How do I get rid of an annoyance?

I don’t even know how it turned into this, but I did something kind of dumb. I just want to forget the whole thing the event, the date, what I did, the person, everything. It’s always stuck in the back of my mind. I don’t even care about the person?

I just want to not think about it. How do I forget it?

How do I get rid of an annoyance?
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