rebuilding trust is probably harder than separating two coats of paint.
but if you choose to continue seeing her, you have to wipe the slate clean, easier said than done, but you have to.
it really doesn't matter if she works with the OM, if she is worthy of being your wife, she'll have the resolve to conduct herself in a professional manner and keep temptaion at bay. if she can't, well then, match.com here we come!.
bottom line is, you can't control her, if she is going to slip up, she will and you'll find out. just trust her, wipe the slate clean and when you get that funny feeling, talk yourself out of it, don't spend energy on it.