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を裏切って

betraying

→ を
phrase Rare #35,990
betraying Used after a person, relationship, or expectation that someone betrays or lets down. The を marks what is being betrayed; 裏切って is the て-form of 裏切る.
JA: 彼は家族を裏切って、海外へ逃げた。
EN: He betrayed his family and fled overseas.

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.

彼は友人を裏切って信用を落とした。

He betrayed his friend and lost their trust.

リンダの夫は彼女を裏切っていた。

Linda’s husband had been cheating on her.

私は両親の期待を裏切ってきた。

I have let my parents down.