well there is this one yaoi I read a long time ago and I only remember the last page....so the chances of finding it again are slim XD

well the uke is a college/university student and has longer hair (i don't know the color but in the drawings its white) and in the last page there is the scene where he is together with his college friends and the talk about love and then one person sayst to the uke that he should also find a lover and he thinks something along the lines " I already have on"....

sry it's not much but maybe someone knows?

Not sure, but in Rapunzel ni Fuku Kaze the character with long white hair says he already has someone he likes, but he's talking about someone else.

thanks for the help but I don't think that's it ^^...I think this manga didn't have multiple stories in one volume >.<