Seaching for a manga

Hello, I am searching for a yaoi manga. What I remember from the plot is that the uke comes back from a vacation that he was supposed to go to with his boyfriend only to find that said boyfriend has left him and has rented their appartment to another guy. So the uke doesn't complain and starts living with the new guy. The uke keeps greeting the new guy from the window of their apartment and the new guy realises that the uke used to great his ex boyfriend like that.

Thank you in advance (▰˘◡˘▰)