LT--He said he would let you know long before something became a problem if things might be headed in that direction, so I would take that to mean he's not anywhere near thinking termination, that it's more about not wanting to cause misunderstandings through email. It seems very much in keeping with how he does things.

As far as therapists not knowing how to deal with attachment, I don't think most are oriented that way in their approach, so they would be more likely to want to focus on relationships outside therapy that need to be worked on. Mine doesn't put any stock in attachment work, for example, and I think that might be more common than seems to be the case by reading what people share here on pc.