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Thanks in advance for your help.
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Something good to a fault :
nice to a fault pleasant to a fault
is used when the habit of a person of being nice/pleasant to others leads to people think that he/she is being too good for some purpose.
This might affect the person who is being nice in a bad way.
It means someone is regularly so pleasant to people, that the habit is, in fact, a fault.
My wife often accuses me of being 'punctual to a fault'. It is a bit more fashionable to be late occasionally.