3、Despite promising to keep our secret safe, he betrayed us by revealing it to everyone, causing irreparable damage to our trust and friendship.
4、The company's CEO, who we believed to be a man of integrity, proved to be a backstabber when he embezzled funds and left us all jobless and betrayed.
5、She promised to stand by me through thick and thin, but when I needed her the most, she turned her back on our friendship, leaving me feeling hurt and betrayed.