Peppermint,
It is not the year of misery that negates the marriage - but the prospect of spending the rest of my life having to deal with the fallout. If it weren't for the kids, I would absolutely wish that I had never met him. The happiness in my marriage did not outweigh this pain. No amount of happiness could make up for this.

Oh yes, lots of things could be worse than this. My sister divorced her unfaithful H, raised her children in poverty while he enjoyed a six-figure income, and just when her life was improving, her son was murdered. Life does not necessarily get better. Quite often it just keeps getting worse.