Lala not reading anything about what's happening in the TV show or what the deal is with Stannis recently, but brief aside:
Book Robb very much dies from authorial fiat, it feels like. I think Martin decided that Robb was being too perfect (a role reserved for Jon Snow?), so he needed to have him make some mistake, but he didn't have the heart to, you know, actually write it. So that's where the whirlwind romance with Jeyne Westerling comes from, to give Robb some new problem to deal with and solid excuse for his downfall. I suspect it was also an excuse for a bit of deconstruction, that abandoning arranged marriages for some newly met true love has a price and doesn't always work out (though Martin of course goes far in the opposite direction to have it lead to disaster rather than something milder). But yeah, Martin spends literally no time describing this; it all happens off-screen, "oh by the way Robb is married now."
I suppose since the TV show (rightly) gives more time to the romance (it's something that adapts well to HBO!), you can read more into it, but as is, I'm not going to fault book Robb too much for having authorial intervention crush him. (And I don't even mean this in a particularly mean way toward Martin, all authors need to do this - you have 2 reasonable things that can happen, but 1 leads to the plot you want to write. Martin himself said as much about Ned: in an alternate universe where Janos Slynt doesn't sell the City Watch to the highest bidder, the City Watch obeys the Hand and arrests Cersei, and the series is very short. So... that can't happen, Slynt needs to be a worse person, and this isn't necessarily Ned's "fault.")