Responses
Could it be this one?
https://www.mangago.zone/read-manga/second_time_of_dawn_istrinyaayanokouji/
its not (￣∇￣") sorry,,
Ummm... Diego?
its about this guy who has an unrequited crush on his childhood friend, but finds out hes getting married, so he gets himself drunk and ends up making a move on his childhood friend's little brother?
okay i thought that was gonna be specific enough but now that i think about it theres like more than one manga with that premise. uhhh. the main character has black hair i think?