It takes two to tango, they both made really bad choices. Even the OP is probably a little at fault for trusting either of them in major areas of his life. And,

It takes two to tango, they both made really bad choices. Even the OP is probably a little at fault for trusting either of them in major areas of his life. And, who said the wife even took a vow to be faithful? I'm married, 'faithful' wasn't anywhere in the vows.