Hi, lonelyowl92, and welcome to Psych Central! I can understand why you would be concerned. What would you do, though, if you found out she was SH-ing again? It might be best not to know. I suggest you get involved in other activities, look for new friends, and even go out again with other women.
And, yes, stay strong for yourself. If need be, then talk to a therapist about this matter, if you can't let it go.
She will be okay. And whatever she does is her choice. You did what you could. Okay? You will survive and can even thrive.