I only remember short a short bit but here it is. There was a teenage girl who like a boy, they were at a party (I’m not quite sure if they were dating or not) but, when she saw him enter the party she hid in the bathroom. She watched him flirting with other girls the whole time, then caught him kissing another girl in the kitchen. She was really mad and stormed out but the boy caught up to her right after she got outside. She yelled at him in front of everyone in the front yard.
I know it’s not a lot to work with but anything would be great!!!!!
1987 Can’t Buy Me Love http://www.imdb.com/title/tt0092718/?ref_=fn_al_tt_1 There was also a remake with Nick Cannon called Love Don’t Cost A Thing but the scene you describe is right out of the Patrick Dempsey version.