Yeah, I read it. Tough situation, but I wonder really if that was just a tipping point. How would you describe your R prior to the Florida thing? Only you can answer if you should "fight" for her, as you put it. But your choice of words is interesting. Fighting for her suggests non LRT tactics to me, and what you should be focusing on is you, your part in however this situation arose, and what you are going to do about it. I could go on about how my W and I ended up where we are, but it does not change anything, we are where we are! And the only path forward for me is the DB path if I want to save my M, which I do. Right now I would say that is a long shot, but I have time, and I am not dealing with OM (although I suspect EA with someone quite a distance away).
DR does not differentiate between how you got to where you are, it lays out the tactics that work. When you boil it all down, we're all dealing with spouses who for one reason or another have made the choice to not be in a R with us AT THIS TIME. The "treatment" for that is pretty much the same IMHO.
You want to do the right thing? Be the best father you can for your kids. Look after yourself. Detach and give her space because any pursuit right now is in vain. Do not be her plan B. Forget about filing.
Something else that crossed my mind, unrelated, is that again in VA, if one spouse commits adultery during the separation period, they can pretty much rule out getting custody of any kids. Have you consulted a L about this? If your W is openly flaunting her PA (wanting to bring OM on trip with friend) especially around your kids something should be done. I may have missed that in previous posts.
M 53, W 48 T 25, M 18 S 15, D 11 "I'me done!" 6/13/2010 Exit started 8/21/2011 ILYBNILWY W consults with L 9/2011, no papers filed Separated 1/16/2012