Glove - Heres my opinion and take it for what it's worth.
My belief is that your W could be sleeping with everyone at the local fire station and it doesn't really make a difference to you right now. She doesn't want to be married, so in her mind, she's already single. For her now, it's not an EA, it's the start of her next relationship.
Now, if the time comes when she is considering reconciling, THAT is the time when what she is doing now matters.
