Something that annoys me

It annoys me when someone says they’ll help you do something, then decides at the last moment to change their mind.

This is the definition of commitment:

com·mit·ment n.

1. The act or an instance of committing, especially:

a. The act of referring a legislative bill to committee.
b. Official consignment, as to a prison or mental health facility.
c. A court order authorizing consignment to a prison.

2.

a. A pledge to do.
b. Something pledged, especially an engagement by contract involving financial obligation.

3. The state of being bound emotionally or intellectually to a course of action or to another person or persons: a deep commitment to liberal policies; a profound commitment to the family.

My hope is that some day, others will understand it also.