No, not really -- I'm kinda confused (but then again, I haven't really followed your sitch, as I said). You mentioned moving to "Piecing," which is why I thought you two were talking about reconciling.
If not, then I'd just suggest you go slow and date each other, and see where it leads. But I think you need to do so with your OWN heart set on the fact that she will probably still be in contact with OM. If you can date your own wife while she's still seeing someone else, more power to ya, but I couldn't.
Otherwise, it's not really a boundary; it's more like a "geeIwishyouwouldn't."
If she claims she's ended it, but you're not yet willing to discuss no-contact and transparency with her, then your reply should be "I really wish I could believe that," or some variation.