Why I hate My Boyfriend

GIRL: I hate my boyfriend! BOY: Why? GIRL: He is so cheap he cant even buy me a simple dinner, are all boys like that? BOY: Of course not, I'm not like that. GIRL: I'm going to break up with him. BOY: Ok but know I'm available. [Girl stands to leave] BOY: Wait, where are you going? GIRL: To break up with my boyfriend of course. BOY: You can't leave. GIRL: Why? BOY: Who is going to pay for the lunch we just had?