An app that uses maps + a rare monster? Pokemon Go, Hentai version?
At first, based on how he was acting, I wasn't too surprised he got dumped, but at least he had the decency to sincerely apologise, so at least he found someone willing to accept him and his...tendencies.
Him switching into his nice boy mode gave the story a special touch as without it this would be the story of a jerk who exploits the love an innocent girl has for him...
In part two she realizes that he lied and goes full yandere: she ties him to her bed and forces him to endure all her fetishes. Story ends with him mindbroken and now as madly in love with her as she is with him. And I mean "madly" literally...
Also, love the Pokemon GO reference there. ( Í¡° ͜ʖ Í¡°)