If a man is having an affair, why would he still keep having sex with his wife?

is it so his wife won't become suspicous? Is he still emotionally attached to his wife? Or does he get added excitment thinking he can have more than one women at a time. Its confusing when you find out your spouse has a girlfriend on the side, yet everything at home seems normal. What do guys out there have to say on this?
 
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