Understanding this person

Well he certainly is interested in you otherwise he would not be speaking with you and I do venture to say that, yes he must consider you a good friend, but he isn't necessarily going to push too hard for fear of losing you either. Maybe he is waiting to see that if some point you will reciprocate? Libra's can wait a very long time (yes even many years), especially if unsure. They have a lot of patience for someone they like.

Oh and I should add, maybe he would like to take it to the next level but he is patiently waiting given your current set of circumstances. just a thought..

What's your sign

Libras are nice and charming to everyone. It probably means nothing. You shouldn't even be thinking about this if you're married or in a relationship

Tell him to back off

He definitely is. Every libra is that way. And no don't trust him too much. Didn't u say that he was your boss or something? It's better to trust people outside of the work area.... Like friends from college or home.