Since they're not in a relationship ... It's just the guy he used to like ...
Spoiler...
He actually likes him because he's resemble the guy that he really likes and not the other way around ... Its like destiny... I peeked on the raws but i don't understand a thing but that's what i think it is ...
Thank you for telling me! I use a different site to get the chapters, so I will make sure to cross reference the order of the panels with multiple sites next time.
I'm curious ...