How do I know if a guy still likes me after I rejected him?

A few weeks ago, a guy that I thought was just a friend casually asked me out. I respectfully rejected him, but we have continued to maintain friendliness as we see one another at work regularly. I would hate to seem like I'm leading him on, but don't want to be right out mean or rude. How can I know if he may still like me?

How do I know if a guy still likes me after I rejected him?
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