Men can have affairs, even lead a double life, while still loving their wives, whereas women have a much harder time being emotionally attached to two different partners and staying sane in the process. Because of this, women are more likely to suffer the negative emotional consequences of an affair than their male counterparts. 

Women are often more forgiving if they find out about an affair, while men are more likely to seek divorce, making the ladies more likely to end up alone, unable to repair the damage.