After Gin, Tosen, and Aizen's betrayal to the Soul Society.

You were immediately transferred to the Division 3rd as the replacement Captain since no one else has bankai and has the personality of leadership like yours despite being the previous 4th seat in Division 2nd you were already strong and have achieved bankai in such a fast pace, but needed more time to fully control your own Bankai.

You had a crush on the Byakuya Kuchiki, the captain of 6th division what makes it worse that you get to see his face every time there is a Captain meeting across the hall always seeing his face every time. You would take a quick few glances at him each time you see him having a crush on someone with same ranking as you is indeed difficult.