Thanks friends for the support. It was a crazy situation, one of which I have learned from. Not only about how people can be, but also a little about temperamental horses as well.
I've also learned not to think with my 'heart', something I wish I knew then, but eh. Live and Learn, right? I am taking a more guarded approach to this other mare I am trying out. I am trying to see her for what she is, and not just going ga-ga for her.
Yes, I might have to pay more, but if she works out to be everything that I want, then she is well worth the price.
As far as the 'shoulda, woulda, coulda' game, it's just a little too late, as unfortunate as it is.