Looking for manga

Hi guys. I'm looking for a you manga where two lovers have been together for a long time. One day one of the guys said that he wants to be exclusive and start dating other people. His partner agrees even though he doesn't want it. They start dating other people. But when the guy who suggested the exclusive relationship sees his ex-partner with another man he regrets it immediately and wants him back. They get back together at the end. Please tell me the title/link of the manga! I believe it's a oneshot but not sure. Thanks everyone!