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Many people are cautious about pursuing a relationship at work, especially if it involves superior/subordinate roles. This can cause difficulties in the work relationship if it does not work out, potential job losses, perception and reality of favoritism, sexual harassment laws, and the list can go on and on. Most managers are educated about this and it is usually frowned upon by their superiors.
It may be best for you and for him if you leave this alone. Give him the opportunity to pursue this if he chooses. Since you have put out the effort once, it is in his playing field now. And if he does pursue, think about how this may effect your job and work relationship, if it works out or if it doesn't work out. Don't take this personally if he does not reciprocate. He may be trying to protect his job and yours, and avoid any problems that may effect your work performance.
Please let me know if you have further questions. Gina