Any attempts to blame the affair on the «problems in the relationship» will be heard as making excuses for their behavior, or even worse, heard as blaming their partner. (gottman.com)
We are always able to justify our actions and give excuses for our behavior. (redeeminggod.com)
Using religion this way does not come from a Christian and so therefore can not be an acceptable excuse for behavior. (religion.blogs.cnn.com)