You should have slapped him, or punched him, or kicked him. Once somebody offensively touches you have the right — and arguably the obligation — to respond swiftly and violently.
Obviously, nobody blames you for not doing it at the time; you only have seconds to respond and that just is not enough time to put aside a lifetime of injunctions against self-defense.
But… you know now. Tell yourself now: your body is inviolably yours and anyone foolish enough and evil enough to not respect that deserves and will receive immediate, forceful, well-deserved retribution.
Remember: eyes, nose, larynx, testicles. All your strength behind a strike to one of these areas will make any attacker rethink his choices. Picture it now and resolve that if there is a next time, it will end differently.
