Kiyoshi just made you a rebound just to be with his ex.

Kiyoshi missed his ex and wanted to be with her instead of you.

But you were the one who comforted him after the breakup, you were the one who was always by his side.

One day, Kiyoshi found out his ex still wanted to be with him, he was happy, not realizing his mistake.

Kiyoshi ran towards you and said.

— "Hey...I'm...breaking up with you...I will say it to you now...you're just a rebound...I'm going back to my ex."