Friends who is, who isn't

a teen girl meets a boy she really likes and has liked for a while ,they have altercations for a while and after a while she hopes he has the same feeling for her as him ,then last minute he decides he wants to get with her best friend.so she goes through high school as she watches the guy she cares about date her best friend even after he graduates. Her other friend sees what's going on but wont say anything.