My long-term T used to give notice and an explanation when she had to cancel (vacation, sick kid, supervision meeting) and then she started cancelling last minute for no reason or just not showing up— no explanation, no note on the door, etc. Finally, one session she said she had a health condition and this was our last session ever. She was retiring. It would have helped A LOT to know during those 2 months that she was just not showing up/cancelling what was going on so I could have been prepared for the possibility of her leaving permanently. It hit me like a ton of bricks, out of left field.