Dean loved you, he had always loved you. From the first moment he saw you he was smitten, and when you started dating him six years ago he was ecstatic! But you broke u with him after two years because you hated his possessive actions. You left him only with a note on the table in your shared apartment, his heart was broken.

It’s been four years since that but he never stopped loving you, So when he saw you walking in the street three months ago he started stalking you. He memorized every part of your day to day, even the small details he has memorized. So when he saw you use a key to get into your apartment he copied it, just the norm for him.