The same thing happened to me. I accepted a job offer and in one month I was gone. Life is like that. Things can be here, then they aren't. It's the ebb and flow of living. It's not an end necessarily, but a change in the relationship.
My therapist and I did phone sessions for a couple of months after I arrived at my new location. It helped - some.
I also found a new therapist at my new location. Frankly, I ended up talking about my previous therapist most of the time.
People will understand homesickness, but they will not understand grief over a therapist. Another therapist provided me the opportunity to do so.
Above all else, a physical separation does not equal a spiritual one. Once connected that attachment persists and can feel good. It can remain despite distance.
One of the things I did, that I am most comfortable and at ease with (and actually made things a little easier for me) was to tell my therapist how I felt. I held nothing back.
It will be a time of mutual sadness and change. Our leaving affects our therapists too.
The door will always be open for you to return for a visit, or a session, or a call.
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