I really can't remember much of this manga...the only things i remember that it was about two guys that were in a relationship base just in sex and one of them was a swindler. The other one always thought that the women that he played with were stupid for falling in his games until one day when he was drinking with his coworkers he listened his partner (the swindler) talking to a woman about him and how he was taking advantage of him. He listened to this and get out of there furiously just when he realized that the other man have followed him. He said he REALLY loves him and that everything was a misunderstanding and blablabla at the end he stops being a swindler and stays with him.

I'm quite sure it was part of a compilations of one-shots XD

If anybody knows the name PLEASE HELP ME (:

"I exist, that is all, and I find it nauseating" -Sartre