I don't really enjoy or date so much... but when I don't see him, I miss him and I dream about our date?

So I m dating a boy, and when I'm with him, I don't feel any special thing,,, but the other day when I don't meet him I start to see the date that we had done in other light

Why is this happening?

I don't really enjoy or date so much... but when I don't see him, I miss him and I dream about our date?
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