While being stared down by you ex’s new girlfriend may be infuriating.
Going to her table and starting a confrontation ending with you shoving her could be deemed and assault.
Her retaliating with Lemon cheesecake is also and assault.
You are both lucky the owner/ manager didn’t report you both to the police.
You both might have been charged and fined. Period.
Certainly you don’t want a police record, now do you?
Future employers look down on that sort of hi jinx!
In the future keep your hands to yourself. It’s not worth the trouble!
Your friend was probably flabbergasted, I know I would have been! Wow!