My brain hurts....just...way too much going on here...
But-from what I can gather, I was feeling the same way the others are, this is an awfully one-sided relationship, far as my eye can see, polyamorus or not.
Wow. I do hope things work out for the best. I'd say ditch the first girl and go with girl b, but I am pretty much clueless about this poly thing, just a member here out of curiousity.