It could be that your therapist is just feeding off of your admitted inability to open up. They might see that as you being "finished" with the process. There could be other issues... insurance, personality, the client load being too high, etc... but you have every right to tell your therapist that you don't feel you are ready to terminate services.

Also, if they still want to terminate, you can always go to another therapist and as Kessa said, maybe the new therapist will be a better fit.

Good luck. Be well!