背叛 (bèi pàn): การทรยศ

My best friend actually told everyone the secret I had shared with him. That betrayal made me never dare trust anyone again.

During the war, he betrayed his country for money and sold military secrets to the enemy.

She discovered that her husband had betrayed their marriage and was with another woman, so she decided to divorce immediately.

The company partner betrayed everyone's trust and fled abroad with all the funds.

He once promised to always support me, but at the critical moment he betrayed our friendship and sided with the opponent.