Love both story
1st
The thing about love is we won't really understand it if we are not in their situation. In the uke's POV he did that cause he thinks that what he did to the person he loved which is the seme since time began was unforgivable knowing that he himself knows that he had hurt the person he loved most with those words, he thought that the seme was hateful for those words thats why his way of redemption is hurting himself. It may not make sense to you but to some people or thats the way the see life's mistake and forgiveness. Thats like saying "i deserve this because i caused too much pained to the person i loved" he didn't know that the seme didn't hold that much grudge though. And in the seme's part, he really did loved the uke, he was hurt but they were friends to begin with, so he was shocked knowing that the uke find it disgusting to have a man to man relationship, that's why he was prying as a friend and wondring why the uke would go to a gay bar knowing that he was disgusted by it, lo and behold as they were opening up, he now understood that the uke felt ashamed of those words because the uke loved him and thought that he had hurt him(seme) so bad to the point of no redemption, but i turned out the other way around. Its a nice story though. Not the usual. For me
Hitori to Hitori no 3650nichi