Why do we like someone we were never initially interested in? Do you think these types of relationships are more genuine?

I had met this guy at school 2 or 3 years ago and I never thought much of him. Last year I had like 4 classes with him but I still didn't like him until the 2nd semester. It was weird too because he showed up in my dream and then I suddenly had feelings for him. He never expected to like me either it took a lot of to time for it to happen. Its just crazy to me how unpredictable love can be.
Why do we like someone we were never initially interested in? Do you think these types of relationships are more genuine?
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