She left him so he got a private detective, found out where she lives, where she works. Realized the place she was working up was going under financially so he bought it just so he could trapped her and try to "win" her back.
This guy is a stalker. A creeper, an asshole. No wonder all he attracts are gold diggers and vapid women, the good ones see him coming and run away because they see "ASSHOLE" written all over his face.