You just described what happened to me yesterday.

I had a regular session last week with T in which I was having a hard time and she noticed. When the session ended, she said twice that she wants me to come in this week (because I tend to cancel also), and I agreed.

Fast forward to last night, it was brutal on my end so I was mad at everyone and everything so what do I do? I email T saying I'm having a rough night, and I don't think Im going to come to session (my session is tomorrow). So an hour ish later I get a reply from T saying that she doesn't recommend I cancel but it's up to me blah blah blah... Told my parents Im cancelling (my family is pretty open about stuff), they got mad at me, so the whole world turns around, and I email T back saying my parents don't want me to cancel either so basically I have no choice but to show up. My T didn't give the slot away at that point either, but emailed rather quickly saying that well keep the regular session for the week...

Sent her like 4 apology emails after that and really don't want to face her tomorrow...