ok but like why was he with the blonde guy if he actually liked the mc in the first place?

Probably because he thought MC only thought of him as an older brother. Was moving on or "trying to" or just to fuck lolol it was the same misunderstanding on both sides ╮(￣▽￣)╭

Yeah, I kinda thought so too based on the BL tropes, but it just bothered me that it wasn’t actually explained. Like, it could’ve also been the case that the blonde and seme were dating at the time, or were friends with benefits during college, or maybe just had a one night stand? I guess I just wanted more clarity on their relationship lmao