I am truly sorry for letting you down.

Meaning

Expressing disappointment in oneself for failing someone.

Examples

• John: 'I failed to meet your expectations, Alice.'<br>
• Alice: '<b>I am truly sorry for letting you down.</b> I'll work harder next time.'
• John: '<b>I am truly sorry for letting you down.</b> We'll revise our plans.'
• Alice: 'I didn't complete the project on time, John. I'm so sorry.'<br>