Responses
My interpretation of it was that Geonha stayed a virgin because he still liked Yuseong and only left him because he believed it was safer for his future. While Yuseong didn’t because he believed that Geonha had left him, so he was trying to move on from his feelings. I think this is why he remembers thinking he had lost his feelings for Geonha in college, but that he was really wrong and just lying to himself (because he was trying to move on).
for the most part it was cute, if you ignore certain things. like the fact that bro was "so into him" but didn't have any problem dating around? meanwhile the bottom stays a virgin like the cliche that they are. This would have made a much better story if the top was also inexperienced and had stayed true to his feelings, or if uke also had his fair share of relationship experiences.