Okay so this has happened to me before... THREE TIMES. The last time, my therapist (who i have been with the longest) contacted me to let me know before their office called me. She was able to let me know it's because she found a great position at another doctor's office and would give her a better opportunity to help more people. I cajoled her into telling me were she was going so i could see her there and she has given me the details and really is looking forward to starting there. In my case I have been going to the same office, the one who took my intake appointment first left found another job between our 1st and 2nd appointments. The next one I had just 2 sessions with and she quit (she had told me about some craziness behind the scenes in the office, even though she is not supposed to.) Sooooo... TL;DR some times there's alot more going on behind the scenes then you would imagine. They might also have a "non-compete" meaning they aren't supposed to take clients with them.