Just remember its all just an illusion, what she thinks is not what she knows. This guy is busy painting a pretty picture, she needs to see a pretty picture right now.
Let it play out, cause 90% of the time the fantasy comes crashing down. You cant have any part of it. She has to come to that realization on her own. That's why they call them fantasies, cause they never live up to the real thing.
She's so willing to look past every fault right now of his, but at the same time willing to blame you, guilt you into every problem she's having.
I hope you learned the two lessons here, 1. don't bring up ANY relationship talk, that just pushes her closer to him. 2. STOP snooping, cause the mind is a powerful tool to use against yourself.
Detach, act "as if", get out and GAL, they're there for a reason. Time can be your friend if your putting in the work on YOU. Right now, are you the person only a fool would leave? then its time to get to work.