How do you learn to be happy after being rejected?

I loved this girl, and she told me she couldn’t reciprocate that feeling. I normally don’t care if a girl likes me or not, but I grew to love her. I don’t even see the point in trying to find love again. When I can’t even be happy that knowing that no one cares for me. I just don’t even feel like eating too.

How do you learn to be happy after being rejected?
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