If she's crying a lot, it could be just from the unbelievable betrayal...not just of the person, but that you've kind of betrayed yourself in some weird way. To be fooled like that doesn't inspire confidence in yourself as a functioning adult. This is different from the kind of cheating spouse betrayal, that's it's own hell, as you well know.
This kind is that this person USED you ON PURPOSE..they played on all your vulnerabilities and pain...they are sadists!!! Soul-sucking amoral vampires. It's hard not to totally FREAK OUT. I gave myself heart, body mind and soul to a sadist. God, I could throw up just talking about it again.
And then, as I said, afterward you are in a state of mental confusion, nothing seems real, you doubt yourself. My H at least doesn't know about it. She knows you know and has that to deal with too.
Here is description of my situation(it's kind of long). Before you think I must have been stupid you have to realize that this happened over time...and that we were part of an online community kind of like this, as well...and he got to play this game, this pretending to be this charming someone he's not, on everyone, really. On the whole group. But *I* was the favored one. Lucky, lucky me.