Your "smothering" behavior started long before her "time of need." I'm calling "b.s." on your intentions here; you saw her weak and vulnerable, and that appealed to the "shining knight" in you, and you wanted to swoop in on your white horse and slay her pain.
I get that. Heck, I AM YOU in so many ways.
But it doesn't work. Look around the forum, and show me where that sort of behavior is working. Fairly or unfairly (and I happen to think it's the latter), a wayward or walkaway wife sees what you are doing as weak, smothering, and UNATTRACTIVE.
In fact, if she were to be honest with you, it P*SSES HER OFF.