I think T's, being human beings (mostly) are influenced greatly by their personal history, experience, and their own analysis, if any.
Sometimes twice a week therapy creates a greater need which the T still can't fill, maybe that was what he was thinking. Personally I wish any of the T's I've seen had ever written such an intelligent and caring email

But it still sucks, very much, hearing "no"
But I like how he reassured you that your relationship with him is safe