I'd like it much better,

I thought the love story added to it very nicely. Here he does this terrible thing, then checks up on her to see how she's doing, or tries to without her knowing, runs into her. meets her, falls for her. Turns up the guilt, emotions and psychology of it all another notch.

I thought the love aspect of it added another layer to the story. As they say: "Truth is stranger than fiction" so what an ironic twist of fate that Henry falls for the very woman he ran over and left for dead.
Also, Henry doing everything he did solely based on guilt would have been too expected; it's all been done before. So to mix in the romantic ingredient was totally unexpected. And since they handled it so subtlely and maturely, it worked for me. Here we have Nathalie's husband who supposedly loves her yet he couldn't have been more distant and emotionally detached if he tried. Then we have Henry who is responsible for putting this woman through the most hell she's ever experienced, yet she forges a deeper connection with him than she's probably ever had with her own husband. So the weaving of the two--guilt and love--played out rather nicely.

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"I don't love you enough to hate you!"

If he didn't love her he would of just went back to New York. The only reason he comes back to face the consequences is because of her.