Why am I having dreams of this girl?

There's this girl whom I went to high school with. We had several classes together, but I didn't really talk to her much. My life was really complicated back then, so I was very shy and quiet most of the time in high school. During senior year, I noticed she was more active and vocal, coming out of her shell compared to the prior 3 year, very fun and bubbly and playful.

I recall her trying to talk to me and teasing me several times, I think she might've had a crush on me, probably because I let win some game were playing once during math class. We're still friends on facebook, so I do try talking to her every once in a while, catch up on stuff.

Recently I had a dream about her and me. I don't remember every detail, but the gist of it was that we were back in high school and dating each other. Months before that, I recall having another dream about her, specifically about me attending her birthday party.

I admit, when we were in school, I thought she was very cute and pretty and nice and friendly, but I never acted on any attraction towards her. So I guess my question is, why am I having dreams about her? Is it because I feel attracted to her? Could it be another reason or is there no reason at all?
Why am I having dreams of this girl?
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