betray someone's trust (betray someone's trust)

Idiom Trust

意味

to break someone's confidence in you

誰かの信頼を裏切る (dareka no shinrai o uragiru)

例文

"She would never betray your trust."

"彼女はあなたの信頼を裏切ることはありません。" (Kanojo wa anata no shinrai o uragiru koto wa arimasen.)