Break faith with her - Idioms by The Free Dictionary
break faith with (someone or something) (redirected from break faith with her)
break faith with (someone or something)
To fail to act as one has promised. After promising so much, the candidate will be in danger of breaking faith with the many groups she courted on the campaign trail.
break/keep ˈfaith with somebody break/keep a promise that you have made to somebody; stop/continue being loyal to somebody: The government claims they have kept faith with the people by reducing the crime rate.