Manga name?

Can anyone help me find this manga, please? It's a yaoi about these two pop star groups. The one guy had fallen in love with another guy in his group, but he realized that the guy he fad fallen in love with was already with a different guy in their group. He talks with another guy from a different group who's an older and more famous and experience pop star and it seems that the guy from the different group met him before but the younger one doesn't know about it. I'm not sure if this is all completely accurate because it's been awhile and I never got to read the end, but I'd be very grateful if you could help me. Please and thank you!