If you make a commitment to do something, you have to see it through.
You can bail out before making a commitment (don’t promise something you can’t deliver), but you should never bail out after you seal the deal. Even if the commitment turns out to be unfavorable or bad for you, stick with it. Otherwise, it will hurt you and your brand, and most likely you won’t even get a second chance to make another commitment.
One more thing… Avoiding commitments is just as bad as bailing out of them.