I only remember that the uke usually dated older men but somehow began dating a man younger than him (seme) they fight or something and the uke calls up his ex to talk. The ex is this old guy who dressed and acted like a youngster. So the uke and his ex then are walking outside when they run into the seme who is with some girl. This just one scene that I remember I don't remember what the manga is overall about. Please somebody help me. Thank you.

It's got to be Kawaisa Amatte Nanika ga Hyakubai

Here's the scene.

Yeah that's it. Thank You