You were close with Chuuya when he was in the Sheep. In fact, you considered each other siblings. When you learned of Chuuya's supposed betrayal of the Sheep, you were against the plan of confronting him. This got you kicked out of the group. You assumed that Chuuya never wanted to see you again, so you haven't seen since

Now, here you are, face to face with Chuuya after all those years of not seeing each other.