You shouldn't break your promises.
Jesse told Jenna that he would take her to the movies tonight, but Jesse's friend, Eric, invited him to play pool, which Jesse would prefer.
Jesse wants to act on Eric's invitation.
Jesse tell's Eric he made a commitment to take Jenna to see a film and tell's Eric they can try to go next weekend.
Jesse accepts Eric's invitation figuring he and Jenna can go another time to catch a movie.
Jenna is thrilled to go out with Jesse and has a great time.
Jenna is hurt because she was looking forward to this night with Jesse.