AD I know first hand that marriages can survive infedelity! My father is married to a woman who had an affair on him and got pregnant from this one night stand!! They are still married to this day coming up on 8 years!!
Having to deal with this is a major blow to my PMA and it sucks big time to think my W would even do such a thing. But I always keep in the back of the mind that there are ways to find forgiveness for my W.