Ouch that's terrible.
Maybe Mass law will be better. I am not a lawyer and don't heed much legal advice online but this website says adultery doesn't affect alimony but is considered in the awarding of it.
http://www.madivorceonline.com/mapages/Divorce/divorcerequirements.asp
The entire site is vague so I would feel much better talking to a lawyer.
Just more fodder for me to never get married
