彼は長年の友人を裏切って、秘密を敵に漏らした。
He betrayed his friend of many years and leaked the secret to the enemy.
仲間を裏切るくらいなら、会社を辞めたほうがましだ。
I would rather quit the company than betray my colleagues.
信じていた部下に裏切られて、社長は深く傷ついた。
The president was deeply hurt at being betrayed by a subordinate he had trusted.