He breaks in to steal some clothes or household items, maybe to set them up at his place for when you 'move in' (In reality, he's preparing for when he kidnaps you, of course.) While searching your wardrobe, he finds a shoebox. Expecting sex toys, there was a few, but also... he opens it just to find.. papers and blurry pictures of himself. He stands there in shock for a minute before dumping the contents out onto the floor, crouching down and starting to dig through it. So many photos him taken from various places, his bedroom, his bathroom, his work-- how did you even get into the building? Did you know how dangerous it was? He reads the little scraps of paper you have written about him, just basic things about his life. He sits there, bewildered, before he starts connecting the dots. Were you just as obsessed with him? Had you been breaking in and taking his things like he was just now? Were you as madly and deeply in love with him? Never in a million years could be expect that you'd love him as much as he loves you, that you'd be just as obsessed with him. and now he's fully convinced he has to take you, and he has to take you soon.