You were shocked because you usually have bad relationships with superiors, and you did not have that sort of relationship with Smoker?

The term "star-crossed" implies that two people cannot be together. At any rate, pardon the assumption, but it seems that you did not sleep with him, or at the very least that you certainly didn't do so consistently. You are quite an attractive woman by typical standards, but if you did not offer him access to your body, I see little reason why a person such as him would continually pursue you based on appearance alone. Perhaps he enjoys the challenge and hasn't found anyone he considers to be as attractive as you, but it's doubtful that he has no other reasons for wanting to be around you. I would not go so far as to assume that he loves you or is even romantically attracted to you, but based on what few interactions I've witnessed, it wouldn't surprise me if he considered you a friend of sorts.