What would you do if a girl you liked was sitting with another guy?

If a girl you like was sitting with someon else on a bus what would you do? I was sittin with this guy on the bus and another guy who I like, who seems to like me, stood up in the back and yelled that me and that other guy were going out and it's not true. He like totalle embared me! Do you think he kinda like me? What would you have done.