Loeri LessMiss, I would think that if nothing to the contrary was agreed upon beforehand, paying your own way would be the rule. Why would it not be?
Why would it be? Are there standard, set rules for dates?
I don't think so. Social arrangements are generally unenforceable in law. To then attempt to enforce your own self applied rules by criminal conduct is not defensible.
Her conduct does not seem totally unreasonable in the circumstances. There are plenty of instances where one party does not pay on a date and the other party is unhappy with this, but sucks it up as part of dating. I've got a female friend who has paid twice for a man to go to the cinema with her recently and once for both their meals, because he said he had no money. She was unhappy with this, but if she wanted a remedy, would not be justified in removing property from him by force.
To me, two drinks and leaving is possibly indicative of someone who wants to get away from a date that isn't working out. It may be that she didn't want the second drink or didn't drink either drink. Its irrelevant though, as social arrangements are not enforceable in law, unless they are put into contractual form in some way. And then, unless it was in writing, you would run into problems of proof. You could presumably bring in the concept of unjust enrichment, but again you need a contract to base it on.