I'm going to make a girl pay for my drink and lie to her
Why would you make her pay for your drink and lie?
So I can get a free drink from her.
It's wrong to take advantage of others. It's wrong to lie to this girl just to get free drinks.
Lying is not wrong, she's a dumb slut. And why should her feelings matter?
She is a human and her feelings matter. If this is how you feel about people you shouldn't be going out at all.