Looking for

Yaoi where in both guys have girlfriends... if I remember it correctly, their gfs knows that they are doing it.. like they have some sort of consent. Then the other guy's gf slept with the other guy and pretended that she was raped by that guy. Something like that. Sorry i don't remember much
I think the guy decided to disappear and the other one looked for him. He found his name arranged through a cigarette butt inside an old abandoned church (not sure if it really is a church)
Sorry it was kind of old manga. Hope someone remembers
Thank you.