I just want to weigh in a bit, since you are asking how do you come back from something like this. I'll draw a comparison, my long time partner cheated on me a few years ago. We broke up for a period of time, but then came back together.

I'd say it takes time and repeated processing of the things that have happened. You might not feel too good about her for a period of time, but IF you still feel like you want to stick with her, it doesn't sound to me like she's a very irresponsible person or someone who you cannot trust. It will most probably go back and forth for a while between feeling comfortable with her/her presence and feeling uncomfortable and mistrusting. It takes quite some work to get through something like this, by which I mean talking about it again if you don't feel good again, and her showing through always responding the way she has so far, as well as not make more slip-ups. But if that's an option for you that you want to try, I think that can work, the same has worked with my partner. Sometimes there's days you despise them and still you can tell them and they don't leave. Bother parties understand what has happened, who's done what wrong and by now we are able to sometimes even joke about it.

This of course is an investment of time and resources into it, which I think can be fruitful, but that of course depends on you.