I think the point is that the seme was in denial with his feelings and assumed that eventually they would both get girlfriends because a "relationship between friends" even one as guys would be something far fetched for them. Complete denial. Now that his cute uke has walked away, he knows how he truly feels, maybe he's still in a bit of denial and surprise though. After all, it is his first experience with love. The seme is more innocent than everyone thinks. (=・ω・=)
I think the point is that the seme was in denial with his feelings and assumed that eventually they would both get girlfriends because a "relationship between friends" even one as guys would be something far fetched for them. Complete denial. Now that his cute uke has walked away, he knows how he truly feels, maybe he's still in a bit of denial and surprise though. After all, it is his first experience with love. The seme is more innocent than everyone thinks. (=・ω・=)