This is a tough one and I'm posting about a friend.
Husband has left out of blue, everything was happy days (or so we all thought).
Absolutely says there's no one else. As far as I can see it's the script. Blaming wife, spark has gone after 13 years. Doesn't think it will come back.
My friend suspects him and a colleague.
What could she do to get evidence or conclusive proof? So hard to leave a marriage and house on a hunch. Although obviously when the trust has gone the marriage is over anyway.