Recently this happened with me. In less than twenty-four hours, I answered, 'no.' I could have said yes, but there's that thing about "being true to one's self." I have boundaries that I do not cross - maybe it makes life a bit limiting, but it's an honest assessment too. In short, if I deceive myself, I might also be deceiving another. Isn't that cruel, and undeserved by the receiving person? You know it, and so do I.
I think the poem called, 'The Serenity Prayer' will always be helpful.
God ~ grant me the serenity to accept the things I cannot change.
~ courage to change the things I can.
And ~ wisdom to know the difference.