Based on those emails and your other comments, Id be *really* suspicious. Sit down and ask her, and tell her why--but Id leave out the emails unless you
absolutely have to.
Anyway you slice it, those emails imply shes up to something with some other guy that you dont even know about--and thats damn suspicious in and of itself. Combine that with the overheard conversation about the *same guy* and you have some pretty solid evidence.
Good luck man, that sucks
