Why would he act interested and then not reply when asked out?

I had a crush on someone at work. We had nice banter and flirtation for a period of months. I finally asked him to hangout outside of work over text and got no reply. I expected at least a "no thanks" but that did not happen.

I still have to see this person. Do I bring it up to clear the air? If so, how?

Why would he act interested and then not reply when asked out?
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