Is there a reason he won't accept me?

He said he's into me and we've been on several dates. I'm around him everyday and I have his number. I tried adding him on FB cause I see he's on it every time we are together but he rejected my request. I can see him accepting all other beautiful girls friend request except mine. I asked him about it but he shrugs about it like its nothing.

Is there a reason he won't accept me?
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