I have the same problem. After letting countless numbers of people down, I've tried to make an attempt at not making promises and not making plans with anyone. Sometimes this can be difficult, but I try to do my best at sticking to this plan. Like if I make plans or promise something to someone I ALWAYS back out at the last moment. So the best thing for me is to not do that! I know it must be almost impossible for someone who is married or who has children to do this, as there are many commitments that must be made.

Hang in there.