>>43683152This was a very endearing read. Like
>>43683173 said your 'B' sounds like what could be described as a tulpa. Pretty uncanny.
Some 10 years ago I went through something a bit similar. I was going through a tough depression and made up this persona that esentially represented everything I thought I needed in a person at the time
(my own 'B', in fact, as her name also started with a B), and I talked to her for a couple years, gradually less and less, until she'd basically outlived her usefulness, although I still think about her with affection. Obviously it was nowhere near as vivid as your experience though.
Anyway, your whole experience is very special. You should make a habit out of writing about it, even if you just keep it to yourself.