Withdrawing sex?

Sa
Note: THIS IS NOT A QUESTION BASED OFF OF MY LIFE. THIS IS A QUESTION I HEAR A LOT OF WOMEN ASK AND BLAME OTHER WOMEN FOR. 
Do you feel if a women restricts her husband or SO from sex that he is not the only person to blame for cheating but that it is her fault to? Example. I have a male friend that is married and he and his wife have sex once every MAYBE 6 months. He's dying inside and drills over every client we work with. And says he is planning on leaving her because of this. Is he justified? If he cheated wouldnit omky be his fault or hers to. 

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