I think there are lots of positives in the conversation you had with B- obviously that you could talk for so long comfortably, and that he was so helpful and attentive when you were speaking. That he wanted to speak and was happy and chatty. I think him sending the mp3 through is also really great- he was clearly thinking of you, at 1:30 in the morning. Naughty thoughts I hope!!
I'm glad you checked out that it was OK to call him soon. I wouldn't worry too much that you're initiating contact right now, mainly because I think the break in contact was from you backing away- so you're 180-ing in a way by initiating a bit.
I also wouldn't worry too much about the girl you don't know. She could just be a girl you don't know, and my H refers to everyone under the sun apart from him and me as 'we'. I think it's an odd thing the WAS does to try and differentiate themselves, but it doesn't mean anything in itself (or that's what I tell myself).
I wish we could meet and bake muffins together and then eat them all in one big go!
