Empty Promises

I think something that I have really learned about myself of the last few months is how much I really dislike people who say one thing and do something completely opposite. It might be that I dislike this so much because I used to be that person. I think that often when we change things about ourselves for the better, we learn to despise the old characteristics about ourselves.
I'm learning that I end up more frustrated when someone says that they will do something, be somewhere, or something along those lines and then they don't follow through. I get people pleasing...trust me I've been there, no, I am still there, but I believe that for most people it hurts worse to be promised something and not receive it than to just never be promised something in the first place.
I'm trying to figure out how to handle all of that. People will obviously let you down at some point because we're all human. We can't always use that as an excuse, but it is the truth. So how do you cope with being let down? What's the solution? Is there even a solution? I think the answer to that looks different for everyone. We all cope differently. I'm not sure there is a solution, but I do think that there is an appropriate way to handle these kinds of situations. I'm trying my best to not blame others when I feel let down, but instead to forgive and not be bitter. I'm learning it's best to work to improve yourself rather than trying to fix everyone around you.