Miscreants and Mayhem
"Can't think straight" https://www.mangago.zone/read-manga/crossing_the_line_1/
He starts off as a homophobic hot shot narcissistic rich douche playboy but slowly realizes how much of a love struck, head over heels loser he is. This man PRETENDED to go to the library to look smart by dressing up as a nerd (glasses and flannel) and going to the library where he is because the uke was mad at him and giving him the silent treatment.
They start off as roommates transition into fuck buddies before the seme fucks it up by catching feels and being an ass about it then silent treatment/break up arc before getting back together
Manhwa or manga where the Top is a loser for his partner (⌒▽⌒)