I have read many stalker book, and this is one of the best. In such books, either the stalker is very cruel to her, or too loving- in which case the story progresses very fast.
You have managed to find the perfect balance, with him being obsessive and possessive, and yet not cruel to her. Also he seems to really love her and not just lust for her.
I hope this message- and probably many others you are getting- will encourage you to update. We are waiting!