What you say makes sense. When we see a therapist, we get some of our socialisation needs met. When I studied online and alone for my postgraduate diploma, I noticed I suddenly needed to go out much more than when I worked in an office with people. I wasn't close to my colleagues in the office, but they were people I could chat to, and they took the edge off any loneliness I felt.

I wonder if this problem is worse with introverts, who need less social interaction to keep them happy. A therapist might be enough for someone whose needs are low.

I found when I left therapy I was more willing to do activities and see people a bit more. Therapy had been the thing I did during the working week, but when I left I needed to find more stuff to do.