I can see Touma trying to understand Kyouko.
But then as soon as Kyouko finds out that Touma knows what she did, she runs away in guilt. Touma looks for her everywhere, gives up his job looking for her, but then he finds her sex videos as well as the new video she did with the previous guy, and his personal life completely tanks.
Meanwhile, the same people who saw Kyouko running really fast see her again running as she flees the confrontation scene. They find her wandering around, recruit her for their local sports team. She regains her confidence, becomes self-sufficient, and successful. This time, she looks for Touma, and she finds him down on his luck working in a cafeteria. She tries to approach him but Touma resents her and explodes.
"You cheat on me then you abandon me after all I tried to do for you?"
Kyouko is now at her peak physically. She easily subdues Touma, carries him home, chains him up, and she begs for his forgiveness everyday as well as pleasuring him against his will, while keeping him chained and fed like a dog.
Watch out for volume 2. "When I returned to my hometown, my childhood friend broke me."