How could you have let us down, granite1 ?
You are feeling what you are feeling
Your T didn't cancel because you don't matter. Your T didn't cancel because she wanted to hurt you. Your T didn't cancel to make you consider leaving.
Those are all responses that come from within you. Those are your thoughts and your alone. When you decide that those are also T's thoughts, then it feels hurtful, as if it is something coming from outside of you, when it actually is coming from inside. When you see T, you can find out what her thoughts are by talking about this, sharing your thoughts and seeing how they compare to hers.