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I don't think that he is looking to take anything he finds into court, but certain things he might find out (ie. confirmation of stealing, cheating, drug use etc.) may prompt him to take quicker, more decisive action against her.
There you go : "may prompt to him to take quicker, more decisive action". That's what I meant by mindset. He should act quick and decisive if that's what he feels he needs to be doing. He doesn't need to go looking for confirmation, heck, that mostly works counter-productive anyway.