I can only tell you what I would do. I'm not the average bird around here, as I will *NEVER* understand why we advise people to basically fly in the thick fog (the gaslighting and fog of their cheating spouse's infidelity), with no instruments (intel). But if I had no independent verification that an affair had ended, and if I had already been (and continued to be) lied to about said affair . . . then I would proceed under the assumption that:
a) it is either still going on; or
b) she wanted to be ABLE to re-ignite it at some point; or
c) she was either with an OM2 or was actively seeking one.
But that's just me. And I would never, ever discuss any legal details with someone with whom I had an active legal matter pending.