真心换来对不起
[zhēn xīn huàn lái duì bù qĭ]
Translates literally to 'sincere heart gained a sorry' meaning one received an apology after showing their sincere intentions or actions to other person(s). This often carries regretful sentiments because an 'apology' is usually given after some negative event or misunderstanding took place. It suggests that despite giving all they have, the result was not as hoped for.