Of all the hairbrained notions.... Are we being trolled here? Do not meet her ex husband on the sly. Just you and her are generating all the data you need.
Bear in mind it's not up to only you whether to stay together or not. Her behavior, as you describe it, is that of a person who is not so terribly keen but doesn't want to rip the bandaid off.
Great post with solid, direct advice and insight.
I don't know El Diablo . It looks like most here , don't know him either.
We can only go on what he's posted , here , in this thread
In the end, El Diablo needs to do what's right for him , her and the kid
I'll be direct and concise on my final advice for him:
1. RUN!