The story was great, the acting was great, but there were a lot of unlikely scenarios and too many easy answers. For one, no one had a cell phone. This was 2004-6, something like that and all they used were pay phones. Where can you find pay phones these days? Then, an abusive, controlling husband chases his wife across the country (btw- he wouldn't have jurisdiction in any state but Texas, he's state patrol!) And then just has a change of heart and walks away - not likely. Mariah Carey knows right where the two guys are. Everyone has unlimited cash. A freight train is right there ready to go to Nashville, where Mariah Carey happens to have a friend, etc, etc, etc. The old girlfriend comes out of the school when Carter is there. It became almost laughable.
Still, it's good and worth watching if you can suspend your disbelief.