The only confusing part to me is the police offered to let her go if she just paid her share, but she refused. The jerk date who left her holding the bag returned the next day to settle up after police visited his home. The charges were dropped.
Melissa, sadly, is today's fool. You don't go to a restaurant unless there's money in your pocket, you can't depend on anyone in this world. But the greater question is: Why anyone would go on a blind date when you could just stay home? In the words of Woody Allen, "Don't knock masturbation, it's sex with someone I love."