First, I'm sorry your friend disappointed you. Your feelings of hurt, confusion, and disappointment are evident in your email (and quite justified, I think).

It seems to me that your friend put herself and her needs above the promise she made to you. There are occasions where this would be perfectly understandable, but the magnitude of your email indicates this does not seem to be one of them. (Missing a lunch date because of urgent work duties - yes. Missing a wedding because of exciting sports event on television - no.)

One issue I would like to set aside, though, is your question about truth-telling. I think people can be completely sincere and forthright, but still be confused about their own values or priorities (or be sincere but then too selfish to follow-through on those sincere sentiments). So your friend is not necessarily lying to you when she says she values you. But she hasn't acted like a real friend would, either.

Delivering on promises is a mark of friendship. You have it right, so don't sweat that you are missing something.

There are other marks, of course, as well. Friends make each other feel cared-for, feel special, feel included, feel that they have a safe place to land. Friends also forgive each other for messing up. Knowing what you do about her, her circumstances, the way she disappointed you, her expressions of friendship now, etc. it is up to you to decide what to do.

It seems to me you have at least 3 options:

1. to forgive her and move on,

2. to end the friendship entirely,

3. or re-shuffle her in your mental/emotional file from 'someone I can rely upon utterly' to 'someone I like but can't get too emotionally involved with.' Good luck figuring it out.