What does a wife do if she has proof her husband is cheating? She is most concerned about him getting half of her retirment because of the divorce. Will the fact the husband has been cheating have any affect on the division of the house, retirement accounts, etc.,?
Adultery is not a factor in property division, though it can affect alimony.
To prove adultery you must prove your spouse had an inclination (some romantic interest in the paramour) and opportunity (spending the night together) to engage in sexual activity.