With regard to my oldT... for the first year I would call him Dr.X because of his degree. Then after about a year he sent me an email and signed his first name only. So I introduced the subject of names and he said since we were in a long-term relationship and since we knew each other well, it would be better to use first names. It took me a long time to call him by his first name.
With NewT he immediately told me to call him by his first name because he wanted the relationship to be more balanced. He does not like the use of titles, even though he has one.
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