This sounds simple and many people would like to think they don't break promises. It does happen tho and sometimes you don't realize you did it. It has do with-you guessed it-being organized. I confessed to my past organization problem. Tho it is still a battle for me but now I know and accept that I have the problem so I work hard at not having an organization problem.
When I wasn't very organized I had a few promises that I know I broke. Not good for business! I never meant to break promises but when I wasn't organized, I forgot many things. Promises are very important to keep!
I make sure now that if I make a promise to readers, clients or anybody that I write it down in a special place. That was my problem, I wouldn't write everything down and I would forget. I have had to apologize to people a few times throughout my years and I feel bad about it. Not only do I feel bad about it, it also doesn't help your reputation. I want people to know they can count on me and the couple promises I forgot about let those people down. They were understanding about it and I did come through for them but I do not like the fact that they had to remind me. Don't let this happen to you. It is easier to break a promise then you think when you forget to do it! Now I am good at keeping my promises, I learned from my mistakes!