What I find sad about it is not so much that he gets dumped - he evidently deserves it - it's the fact that he has evidently been on this whole 'Lord of the Vampires' power trip for so long that he is unable to come down from it. He evidently does have some sort of feelings for this woman underneath all the bluster, but he can't express them properly - the only sorts of relationships he truly comprehends are master/slave and hunter/hunted. If he could just get down off his high horse for a few minutes, he might yet be able to salvage the relationship, or at least have it end a little more gracefully, but he can't. Even if he ever felt the desire to reject his dreams of power and evil and take up a (relatively) normal life, he wouldn't be able to, because this way of behaving is all he knows. In that sense, he really is somewhat pitiful.