betraying ...
リンダの夫は彼女を裏切っていた。
Linda’s husband had been cheating on her.
彼は友人を裏切って信用を落とした。
He betrayed his friend and lost their trust.
人は友を裏切ってはいけない。
People must not betray their friends.
彼女は何年も夫を裏切ってきた。
She has been cheating on her husband for years.