I am allowed to say the words, ‘I can’t!’  Granted my mate has heard those two words too often.  Nevertheless I am allowed to say them.  Sometimes she is being unreasonable insisting on something which I can’t fulfill.  Other times she is not and I have to try harder.  Nevertheless, I always have the right to say those words.  Along with the words, ‘I won’t.’  I have to set limits on other people’s demands, even my “other’s”.  “No” can be a pretty powerful word but you can’t go there all the time then it loses its force and your mate gets tired of your negativity.  You have to be more careful with its use.