Where did they say they expected him to pay for the whole thing? You're kind of putting words in their mouth there.

“He also left me with the bill” that’s pretty self explanatory. She was expecting him to pay for her meal Even when they weren’t a good match.

....??? It literally isn't??? He left them to pay the whole bill, it doesn't mean, "Oh no, I can't believe he didn't pay for the whole thing." They're lamenting that they were left to pay for the whole thing. He made the choice to get really expensive things and then bail. Even if it's a shitty date, that's a dick move, and that's what the OP was complaining about.

They should have split, not that he was obligated but neither was she

too bad that's not how the world works. if he leaves you can't just tell the restaurant you'll only pay half since the man who was here is a meanie....