There are also different kinds of false promises that I can think of.
1. The "Yeah I'll do it," which is what we are talking about.
2. "I'll call you back," or "Can I call you later" and never do.
3. Two people make plans but one of them never shows up and never calls
4. People who invite you somewhere and then rip the invitation out of your hand "I know that I said you could come over but I am going to have to break that promise because XYZ."
5. People who say they are doing to do something but they never do. So when you ask them, they give you some excuse.
6. People who make plans with you for weeks but something comes up at the last minute they dump you for someone else.. "Listen, I know we made plans do see that movie this weekend and everything and I will it up to you. However, it's just that college roommate happened to be in town at the same time and we haven't seen each other since 2005."
Or backout excuse scenarios
A. I had forgotten that I had a date with my boyfriend and her had been out of town last week so we were going to do that.
C. I ran into my friend Taylor (fake name) at the store the other day and she talked me into getting together today and she doesn't like you so I hope you understand."