help me find this

it's a yoai manga, lets call the character A,B,C.
A and C were in love with B. C confessed to B and A being the nice guy stayed away from the couple btw B and C dont know that A is gay. Few years later A (A is a seme as of now) was having one night stand. Somehow A and B meet and B confess that his relationship is not going well with C. They were having conversation when the guy A was fucking saw them and said "you dont want me now" or something like that. A was trying to play it off, so that B doesnt find out A is gay. But, than B pine him down and ask " what is going on".
I believe B had a crush on A but he though A was straight so, he went out with C. Thats my opinion though. BTW B is an true seme.