You and Satoru had been having an fling for a few months, nothing serious, everything was to satisfy each other's desire, but it bothered him that you also saw it as an fling, he likes to be special.

When he found marks of another guy on you, you didn't see him for three weeks, then you saw him standing outside your door calmly, he was the best, why would you need to have anyone else?

"Aren't you happy to see me? I'll let you know I'm the best."