What's the usual way you get over someone and forget about them?

Can you just suddenly forget about them by busying yourself with enough other activities, or does it usually take falling in love with someone else that makes you forget about them?

By falling in love with someone else
When the unrequited lover does something extremely off putting
When they stop doing the things I initially liked about them
When I realized they really will never want me
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What's the usual way you get over someone and forget about them?
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