Why causes someone to become obsessed with another person?

It really scared me how much I was obsessed with this girl, and it caused a lot of problems for me and her. Thinking back to it, I have no idea how it happened in the first place. I hated myself for it and found it illogical at the time, but it wouldn't go away.

I don't want this to happen again and would like to know want causes this in people.
Why causes someone to become obsessed with another person?
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