A married man is courting me, is he serious about this?

This man that I'm talking about has been courting me for roughly a year now.
It has changed from flirty and kinda sexual in the beginning to very tender and serious now. He must have noticed that I didn't like what he was doing in the beginning. He's married after all. Since he's a co-worker of mine, in a higher position than me and well regarded by everyone, I had decided to keep it a secret and be cool about it.
I showed him clear boundaries and I'm glad he's reacting to that. But he's still pursuing me - asking about my day and such things, still being sincere and very obvious about his interest in me.
I block it off though. Now he seems sad.
What the heck?
If he wants me, he should tell me, no?
Why the confusion?
Is he ever gonna do anything about all of this?
A married man is courting me, is he serious about this?
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