He'd abandoned his desire for a rematch with Jin. It was a weak, but acceptable, reason to follow Jin to every tournament. The press ate it up and he didn't have to explain further. But, it was more than pride.
The reason was in those moments when he saw his name beside Jin's on the fight schedule and his chest swelled with anticipation, when he faced his "rival" and his heart pounded out a rhythm that just felt right. Then, there was the unsettling realization that he didn't care if he lost, as long as Jin won.