Playing the Part [Harry Styles/Zayn Malik]

Harry and Zayn both planned to try out for the part of Andy in a new movie coming out, called 'Hearts Left Unbroken': a story about a heartbroken boy who gets dumped by his girlfriend and tries to win back her affection. After doing well in the script reading, both boys are told they are going to get a call back (a second chance to prove what they can do). But when they both show up at the same call back, not knowing the other was trying out, they're both left surprised and speechless. How could you compete with your best friend for a part you desperately wanted?
What makes the whole dilemma worse is that the director isn't giving them a call back, they're doing live role play. The boys have to completely change their appearances and go into a local college as teacher's assistants, Harry in a photography class and Zayn in a painting class, and try to fall completely in love with a girl. They have to spend six months at the college as each other's room mates, developing a relationship and literally falling head over heels for their girls. But at the end of the six months, the boys have to break up with them, so they know what heart break feels like, and then come back and audition for the parts again.
As the time goes by with the two girls, Kate and Fatima, will they end their relationships for a part in a stupid movie, or stay with the two girls who have finally made them feel... normal?