I've been against divorce since I was 5. Guess what happened then?
There were regrets with all it affected including the one who initiated the divorce.
I just listened to a Biblical message that covered this topic and it reminded me of your friends, so I thought I should post it here.
I hope they have reconciled.
This message is 10 times better than anything I ever heard taught by one former non-denominational pastor I knew and was a member of his church. His marriage eventually ended and he remarried. His preaching was weak in this area and married couples in his congregation started leaving their spouses. They were for very frivolous reasons. Anyhow, here's the sermon that might be a blessing.
Tragic Story of Michal