>> In addition, then by saying "yes" all the time, I find that causes resentment to build up inside myself,

For me many times that resentment ends up exploding out to the person asking the favor. In my mind it should be "obvious" to them that they are putting me out of my way over and over when in fact I am signalling them that I am perfectly fine with them asking over and over. Then I end up exploding at them, so not only the the anger that I was trying to hide come out, it comes out all at once, seemingly out of nowhere, leading them to think I am a crazy person. And then I feel worse because they won't ask anymore even for the things that I ENJOY doing and being asked to do. Why risk another uncomfortable explosion?

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