Need help finding a yandere oneshot.

It's a about a couple. The guy is presented as a scumbag with a girlfriend that's too good to him. The girl in reality is having the boyfriend become more dependent on her, and also spreading the rumor that he is a scumbag so he depends on her more. She very much is a controlling yandere.
It ends with the guy and girl in a car.

no it's not h-manga.