Do you perchance know the whole story - was she separated, was her former husband an abuser - I'll admit I don't know, but, let's show some restraint before we cast aspersion about as if we were the press ...
On the other side of the coin, even if she was seperated, seperation is a time for cooling down and ultimate reconcilliation. Unfortunately, too many people use it as a time to stick their toe in the water of romance. Well gee whiz, suddenly someone is paying more attention to me than hubby did. Isn't that a common theme in dating, putting your best foot forward always. IF he interferred with the reconcilliation process, despite her assurances of no hope, then he was IMHO and I believe by scripture in error.