1. I planned to meet a plate one night last week after not seeing her for weeks
  2. I cancelled on the day in the morning with no explanation
  3. I message her today and she's mad with me for cancelling
  4. I just told her then okay then be mad and left it at that

I never apologized as I don't feel the need to apologize for having a life, and I didn't explain to her why I was cancelling because that's not her business.