Christians do not have such a lax attitude toward marriage. Just because one spouse was not faithful is not reason enough for the other to be so, too, especially when the first spouse is trying to overcome his unfaithfulness. They are one flesh, and, as that implies, are not easily divided.
He's an admitted fraud. Walk in her shoes.
She needs to protect her children and herself. She should start with an HIV/AIDS test.
ps. I am a Christian and don't have a "lax attitude" about marriage. Are you judging?
I find this comment absurd.
If she considered marriage sacred she send him packing. He betrayed her trust in the worst way and her "Christian" forgiveness is posing and posturing; pure crap in my book.
Forgiveness for this jerks disgusting betrayal is his business with G-d.
If she had a shred of self respect she dump him and move on. Obviously the "church" is more important to her than righteousness.
However, in this day and age there are sexually transmitted diseases that will kill you, AIDS, Hep B&C, as far as I am concerned, if him and his wife were still intimate, then he endangered her life. I don't think anyone on here,including Christians, would expect you to stay with a spouse who endangered your life.