It's a Manga I read a few years and I wantes to re read it but forgot the name.
It's about a company that makes a program that predicts how compatible a couple is and want to test it before market launch. And they offer a guy with no job or a crappy job ( I don't remember well) to live with a women he had excellent compatibilty and at the end they will give him money.
The thing is he has a girlfriend. He accpets and in the end he falls in love with the woman and her with him. He realizes his girldfriend was with him for status or something lika that and breaks up with her. The woman was actually really important in the company so she works and he takes care of the house.

First part Ore x Yome in Ore x Yome - Cupid no Itazura.

~4400 manga completed
~1700 ongoing...