I keep in touch with my old therapist from college (think 30 years ago). He's retired now. I had contacted him after graduation a few times concerning my career file, etc. (he also was the head of career services for my university) and recommendations for therapists in my area. We just kind of kept touching base via phone and eventually email (when it finally existed -- yes, I'm old) over the years. Not constantly. Maybe 3 or 4 times a year we check on each other. Not AT ALL therapy related beyond what I mentioned above. Just keeping track of family, health, jobs, etc. It works for us because there was great physical distance between us (I've only actually seen him 3 times in 30 years when we happened to be in that neck of the woods.) It works because there was never any illusions that he would or could ever be my therapist again, so it set a good healthy boundary there. It works because I had no transference issues concerning him; we just became kind of distant, life-long friends, but nothing terribly intimate (it's not like we're best friends or anything).