On a purely practical level, Erin, you better duck for cover - at least for now - and pray the wife doesn't know you so you don't find yourself in court in the midst of someone else's mess.
And I don't mean to sound cruel, but the fact he hasn't contacted you seems to be a pretty loud and clear message that he doesn't want or need your support to get through this. You can look at it this way, at least you didn't have that much time invested in the relationship.
And no shame on you. We're all human and sometimes the rules get broken.