If you have dettached without her around, how are you going to feel if she comes back but can still see the OM? And she comes home at...4 am? Or not until the following day?
Or, seeing her get all dolled up in a short, low-cut dress and new sexy lingerie underneath, for a date with OM?
I'm not trying to be cruel, Tank, but this is what you're going to be in for under Option #1, and it's no way to live.