The System's Bet, I Want to Lose

My fiancé's lover is a Task-Taker with a System.

I made a bet with her:

Whoever Caleb chooses three times wins. The loser must vanish forever.

She leaned into Caleb's arms, her eyes filled with disdain as she looked at me.

"Then I've already won," she sneered.

I smiled back, thinking of everything Caleb had done since she appeared.

He abandoned me on a rainy night, lied to me for her sake, and disappeared when I was sick.

She didn't know that from the very beginning, I didn't want to win.