Hurt & Betrayal?

Well yeah. They often try to avoid all the guilt they feel all ready and in doing so take some pressure off themselves by putting it on someone else. The most logical option would be their (ex-)spouse. Half the time, it's not on purpose and it's often just said because of something they feel about themselves. Just brush your shoulder's off and give them the cold shoulder. It's the only way to make them feel stupid...I'm not saying leave them if there still is a chance at the relationship but just to teach them that the blame game isn't an adult resolution to things. Leave it to the teenagers...