why was it a word to be kept in the first place is besides me

Does “besides me” means “I don’t know”?

Q: Does "besides me" mean "I don't know"?
A: It could, but when you look at the whole sentence you realize that the writer thinks the promise shouldn't have been made in the first place. It's like saying, "I don't think you should have made the promise in the first place, but it's good that you kept your word."

(Others may disagree.)
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I think he messed up the phrase. It should be "... is beyond me".