Exactly. OP, I would definitely recommend to sit down with your girlfriend and tell her, in detail, the evolution of your emotional discovery. Part of being a sovereign being is to be honest to yourself and to others. This is something I'm striving to do every day. If your girlfriend doesn't take it kindly, oh well.
Do you have her parents' contact info? If not, get it, and let them know if she tries to attempt such a thing.
Based on this, I think it would be wise to part ways from her temporarily after you end it, so she can let her feelings for you subside. If she doesn't take time away from you before you two jump into friendship, I worry her feelings for you might linger longer, and might even get stronger, as I imagine she'd be contacting you regularly. After her feelings for you have subsided, I'd say it's safe to enter friendship. This one may be a bit risky, though, as her feelings for you could return, and I don't think there's any way for you to know for sure if she's over you romantically and sexually.