Is there an intention to lead you or others in a certain direction or maybe he is just a private person? People in a leadership role often have to have certain boundaries with others, and that might be it. But since I don't know him, it's really hard to say.
But I empathize with how emotionally painful it is to have feelings for someone who is taken. I have been through something similar in the past. I can't tell you what the best thing for you is, I think deep down we know what is best for ourselves. Just know I'm sending you good vibes.