MLC, WAW or WW?? Who really knows? Help...pls

[ROE]

Sandi, the disrespect reared its ugly head officially when I confronted her about OM which at the time was an EA at the least. My insisting she give up the relationship triggered the next chain of events. I failed to enforce any consequences for the bad behavior. This is where it boils down too. Now I've painted myself into a corner and just don't know what to do. I'm ashamed to say but as I sit here watching my daughters soccer game. I find my W sitting across the field and sitting with OM. Im not sure how to handle this anymore without just filing. She said she's moving out soon and I'm just not sure how to save this thing. Maybe the only thing I can do is save my dignity and move on.