What would you do if your friend break his(or her) promise for you?

Well I would suggest telling her how you feel. Maybe she doesn't realize that her actions are affecting you. Some people live in their own little world. If you have already done that then you will just have to realize that you cannot count on her. You will have to change your friendship accordingly.

This could have many reasons behind it and none of them are intentional. First, how long have you been freinds (how well do you really know her?) Is this a part of who she is? Does she require more space in a relationship and doesn't know how to express this to you with out hurting your feelings, Does she have a family or a busy lifestyle to contend with? So many things could contribute to this behavior. She may feel pressured and not want to hurt you and ends up doing just so even though she may mean to keep her promises. Have you tryed to talk about this with her? Is she aware of how your feeling? Communication plays a huge role in a freindship as does understanding, compassion and forgiveness.

There really is nothing you can do about it except talk to her. Tell her how you really feel about it. You can be nice about it, you don't have to be mean or accusing. Just tell her how you feel. Tell her how it makes you ,like she doesn't respect you enough to just call and say she can't make it. Don't be accusing as in you should of called me. Just say I was hurt that you didn't call. Make all the talk about how you feel, not attacking her at her shortcomings.

I will so sad because he/she hurt my heart.

You said "I can hardly put up with her.." Are there other issues than the breaking of promises? Has she been unreliable since the beginning of the friendship or is this a recent development?