Why do Humans want Closure?

Things don't work out, the other person doesn't seem to care... but you get stuck, wondering why things didn't work out, wanting the truth, being so unsure of yourself.

Why do humans want closure?

I ask because I fell in love with a girl, I have no clue what actually happened between us, she won't give me a clear answer, I don't know the perfect thing to say, and I can't move on. I really want to know how she truly felt, If I'm just crazy or she did actually like me. Or just some piece of information that would help me move on.
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Why do Humans want Closure?
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