How do you deal with unrequited love?

Especially when you know there is a spark between you two, but one (or both) parties needs to learn life lessons, work on things, or mature a bit before either of you would be ready. Do you keep the person as a friend, which may create even more hurt feelings, or do you focus on other things to hopefully be a better person in the future?
How do you deal with unrequited love?
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