How to write a critical letter when I overslept during the holiday and didn't reply to my girlfriend's information?

Do you have to write a critical letter just because you overslept once and didn't reply? If so, there will inevitably be some friction when two people get along. If you write every time, how much should you write? What's more, the love between two people is too tired, and the nature of love has changed. Will they go far? So when two people are together, they should put themselves in their shoes and extend the shelf life of love.

Of course, self-criticism is also a necessary skill. You should explain your mistake and ask for forgiveness. If you make a mistake in the future, you may be punished.