The reason I say protect yourself first is because when you expose you can expect her to rain 'fire and brimstone' on you. She will threaten and tell you that she was thinking of getting back together, but now that you have exposed you can forget about it.
It's all par for the course. She has already crossed the line. She has admitted it. She wants to get rid of you so she can be with OM. Those are her priorities, wants and desires at this moment in time. Do not be fooled into believing that she is contemplating reconciliation with you or will be any time in the near future.
M:11 | T:12 | Status: Married 4C's of WAS communication: Cool, Calm, Collected and CONFIDENT