
What you describe doesn't sound a typical example of the breed. Mine would have been jumping all over you, saying me, me me!
And, as you ask, I have never seen this sort of nervousness exhibited, even with people who don't put in as much socialisation as I do. I feel sorry for the pup - as you obviously do. But,,, can you afford to let your heart rule your head when you have another dog to think about?
Difficult decision for you I know. :-(