You mean the One? Yeah, I didn't like that either, especially since Ax-man is my favourite character.
I was very interested to know what happened when Ax returned to the Andalite homeworld
but KA didn't put that in book 54 ... so I guess that'll always remain a mystery.
Oh yeah, and Ax did "fake"-dump her, but in
the Deception he says something about wanting to have a family with Estrid *aww*