I few months ago we were trying to get out together. Due to complicated timing I thought we had an evening schuduled and I suggested that the next night as an option instead as a better band was playing. I missed the fact she did tell me she was not available on the next night. She did tell me but I missed it. I could have seen her on the original night but  wanted the next night instead.
 She recently reached out in a super polite way to show me my error, not hers.  I thought I was stood up but now realize after reading my emails too her it was my fault not hers.  
 
She has been a complete class act about this, I feel this is a true reflection of her and offer a "somewhat public"  apology