somedude:
You were absolutely right about one thing you said in your post, there is no way for this to end well!
Chalk it up to a beautiful, lonely woman, too much liquor, and a lesson learned. Tell her you don't feel comfortable starting a relationship with her while she is still in a relationship with her husband. Keep it friendly and professional at work. It is possible to be cool at work with someone you formerly made out with (lots of people do it), but you have to be resolved in your own mind that this is not something you consider ethical behaviour or your bound to end up in a repeat of the other night.
I know it's hard as an ex JW to figure out what your moral standards are going to be. I'm struggling with this one myself. JW's are so ridiculously prudish in their morality that they lose credibility. So a lot of ex-JW's think that anything goes for a while. Most societal norms are against cheating spouses though. At least in lip service if not in practice. Not good for the kids. Makes for messy, sometimes murderous divorces. Hey if there are no kids involved and the three of you are into open relationships or threesomes, that's your business. However, if you were really comfortable with this you wouldn't be asking this forum and titling your post "moral crises".
If you really think you love this woman, and she doesn't love her husband, than the onus is on her to end her relationship with him first. If she's not willing to do this without having another man waiting in the wings first, then I agree with Jez, she is emotionally immature and may cheat on you too if you hook up with her. Regardless of what she does, though, you need to know what your standards are. And if you decide to cool it, don't torture yourself by still seeing her socially. You've already shown you can't resist that temptation. You probably don't want to see her for drinks with her husband there either. It would be hard to look him in the face knowing you already made out with her. Plus if she ever told him, he might be really pissed and decide to rearrange your face for you.
Hope this is helpful,
Cog