Rick,
If you would like to expose to your family, her siblings, your siblings, your pastor, her employer, OM's employer, your employer, and any pro-marriage friends you may have...and wait on exposing to her mom...that would be okay. <img src="/ubbt/images/graemlins/tongue.gif" alt="" /> Remember, the intent of exposure is not vengeance, but rather to bring to the light of day the little dark secret that she has been hiding. If HER choices damage her relationships with her own family, it is HER BEHAVIOR and not your telling that has done the damage!!
My suggestion would be to begin exposure as soon as possible. Tell your family and employer so that they know what's going on with you and can offer what support is available. Sometimes employers will see a bit of a decrease in productivity and can offer time off, counseling, etc. Tell her family so they are aware of her choices and can encourage her to do what's right and return to the M. Tell her employer so they know they are at risk for sexual harassment. If she is using company time or resources (laptop, cell, car, travel) to continue unwanted sexual contact, that is sexual harassment even if YOU are the one who doesn't want it! They have a legal right to know, and just informing them puts the company in a position to have to investigate...that will put pressure on the A to end. Tell OM's W and OM's employer for the same reasons--they have a right to know and may need to legally protect themselves.
You do not HAVE to expose to her mom--especially if the truth would be extremely destructive. However, if you do choose to expose, remember that it is HER BEHAVIOR that caused the destruction, not your telling. Just remember that.
Finally, after you have spent the day exposing all day today, prepare for the fury. When a WS finds out that their secret is no longer hidden, they are FURIOUS!!! You will hear stuff like:
"I WAS going to work on our M but now it's really OVER!"
and
"How can I trust you again after you did this to me?"
and
"You have humiliated me in front of everyone!"
Let those words roll off your back. It's hard to hear them but it's just the babbling of a WS. Here at MB we call it Fog Babble. It's the strange stuff that all WS's say, and you just look at them and wonder, "Did you just hear what you said to me, because you could not POSSIBLY mean that!" <img src="/ubbt/images/graemlins/eek.gif" alt="" />
So, expose today. Then come back and tell us how exposure went or ask us for tips on how to do it...etc. We'll be here for ya!
--CJ