약속했지만

약속했지만

"약속했지만" means "I promised, but..." in English.

The word '약속했지만' is used here to indicate a promise made followed by a counteraction, introducing the contrast with '결국 오지 않았습니다'.

그는 약속했지만 결국 오지 않았습니다.

He promised but ultimately did not come.

In this instance, '약속했지만' represents a commitment that clashes with the subsequent decision caused by an emergent need.

내일은 약속했지만 급한 일이 생겨 취소했습니다.

I had an appointment for tomorrow but had to cancel it due to an urgent matter.

Here, '약속했지만' suggests a promise made that introduces a perceived regret or oversight described in the following clause.

그녀에게 약속했지만 그만 깜빡 잊어버렸어요.

I promised her but unfortunately forgot about it.