It probably is best to break things off. Your gf doesn’t deserve someone thats disgusted by her. It is a sign of your own insecurity and if you can’t see yourself getting over it then let her go. You’d feel really shitty if your partner was disgusted by you for doing the exact same things that they had done.

She has a past like almost everyone else on the planet, including you. Probably best to not be in a relationship until you can be comfortable with that. But make it clear that this is something YOU need to work through, not something SHE needs to walk you through.