Why do we get lonely despite sorrounded by people?

I used to love a guy back during my university days. I showed an interest by telling him that I like him. But he never reciprocated. It has been a lot of time now. I am still single. Also, I am wise enough to understand that I cannot force anybody to like me. But sometimes I feel a bit lonely as if something is absent. I don't know the reason why. Can anyone tell me what do I lack?
Why do we get lonely despite sorrounded by people?
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