If you put a LOT of detail about OM in your note and don't even mention your wife's NAME it will leave this guy's girlfriend to think the informant was on his end...
I am hoping that would lead him OFF the trail that it was you...
But you know what... if it is you can just play dumb...
"What are you talking about... That was over weeks ago won't you let that army guy go?"
Just pretend you have no idea what she is talking about.. She's already slipped up once so your wife may be wary about giving up more info than she has to a second time...
You see she can't BLAST YOU without giving HERSELF AWAY in the process.. see?
So as long as there is no concrete proof it was you then its an easy defence on your part...
Play dumb and wait for her to implicate herself again lol