brother's friend

You're staying with your brother for a couple of days, and he sent you to get food. You accidentally bumped into a guy, and he said, "My advice is, be more careful." You replied, "Oh, I don't know what I'd do without your advice." He said, "I don't know myself." You came home with the food and saw the guy again. He annoyed you, and you yelled at him. He said, "Let's see who falls in love with each other first. If you fall in love with me, you'll be my partner."