我这人记性很好，别人答应过我的东西我都记得。 不过我也知道，许诺的人经常都不能守诺。You know, "promises are made to be broken." 所以我也经常说，"Don't make promises you cannot keep!"

一个说话算数的人是a man of his word/a woman of her word

His word is his bond (=he always does what he promises to do)

食言：go back on one's word

英文有一个短语"eat one's words",但是这个短语不是“食言”的意思，而是“承认自己说过的话是错误的”：eat your words- to admit that what you said was wrong:
I'm going to make you eat your words.

我向你保证 - I promise you./I give you my word./You have my word.

当你向别人许诺时，你可以说"cross my heart"以表示你会遵守承诺：cross my heart (and hope to die) spoken informal used to say that you promise that you will do something, or that what you are saying is true

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