He rejected me, now he is adding me on facebook. What's this all about?

I went to the movies with a guy about 2 weeks ago and the next day I texted him to say thank you and if he wanted to we should hang out again sometime. He never relied. So I came to terms with the fact that the guy is obviously not interested and I got over the rejection and moved on. But now, two weeks later, the guy sends me a friend request on facebook. It could just be a random thing and he is adding me cause he recognizes me, since that is how half of the facebook population adds each other. My problem is, that they guy obviously rejected me, he never replied to me, not even to say he is not interested, nothing..., and now he is adding me on facebook.

am I over analyzing this cause I don't think that's normal.
He rejected me, now he is adding me on facebook. What's this all about?
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