Hi Swan
Have you ever had any of your clients miss you a lot afterwards? Have you ever had any who did not want the therapy to end or couldn't find closure?
Every now and then I get a letter or email from an old client. I can't say I ever had one that didn't want the therapy to end. By the time we finish our work they are happy and able to move on with their lives with the knowledge that if something comes up they can return to deal with it.
I know I missed my therapist. It is hard to leave someone who you have shared so much with. Finding closure though is a part of the work that needs to be done, guided by the therapist before the last session.
There is a good little book When to Say Goodbye to your Therapist by Johnson, C. that can be helpful in knowing when to end and when it has gone on too long. Hopefully by the time you are finished working together you know you have the tools to deal with problems on your own.