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Cow1919 maybe demand is the wrong word, consider parameter or envelope. If you want X you must agree to y.
There is no sin in any way to offering conditions to your help.
Otherwise, you stand to suddenly reap whatever ill conditions result from someone else's problems. Be the good listener, keep the secret to yourself. And be satisfied that at least you're not standing around doing nothing. I like the term used by doctors, and lawyers, client confidentiality.
I understand your desire not to make demands. But if we allow anyone and everyone to abuse our goodnatures, then we will ultimately do them no good and only harm to ourselves.