OP didn't explain the details of the 'find' until later in the thread. Regardless of the nuances and arguments about snooping, how one handles finding out a secret about a partner is what really matters. (Not that the matter of snooping isn't important, but I think it's been settled here.)
OP hasn't talked to her partner yet, and needs to. ANYONE who finds out ANYTHING about someone and is upset about it needs to TALK first and foremost to that person.
(PS: I didn't ask for the Uber Member designation and don't even like the term.)