I do not have any "professional" documentation or evidence of her affair other than her admissions to me and the fact she has moved out and is believed to be living with another man.
What advantages are there in proving her infidelity and affairs in a divorce case? Is it worth pursuing?
I am unable to give you legal advice on divorce. I can give general divorce help for men, though, my knowledge is based on Texas divorce laws where I am licensed to practice.
Adultery is very common now; so much so that judge's are typically more surprised when they don't hear about it in a divorce action.
However, if you can provide proof of this affair you can allege fault in the breakup and ask for a disproportionate share of the property. The longer the time between the date of separation and filing for the divorce, the less of an impact the affair will have on the judge.
If her affair is the reason for the divorce then that should be alleged in the Petition or Counterpetition and argued during the division of property at the final trial.
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Remember, I am unable to provide you with anything more than divorce tips for men, so please consult with a mens divorce attorney in your jurisdiction.