How to know if ENTP likes INTJ...we work together and I'm his supervisor.

I am an INTJ and I work with an ENTP that I think may like me. I'm not sure how to tell if he likes me as a friend or more than a friend. We work together and I'm his direct supervisor so I'm not sure if he likes me and is keeping it to himself or he just really isn't interested but finds me fun to talk to in a friend sort of way.

We won't be working together much longer (couple more months). He will be finishing his bachelor's degree and getting a different job. So is it possible he is just being subtle until we no longer work together? I haven't come directly out and said I don't want to date a co-worker to him but the conversation has come up in the past around others I work with and I did say I believe it can make things more difficult when coworkers date, especially supervisor and a subordinate.

Just wondering if I should hold out hope for when we no longer work together or move on now? I usually feel like I can read people pretty well but I don't trust how I'm reading him...he is just so friendly with everyone (which I know is a quality ENTP's are known for). Is there anything specific I can look for to figure out if there something more than friendship between us?