The struggles of dealing with false friends, backstabbers, and troublemakers make me think of movies such as 'Mean Girls' and 'Cruel Intentions.' These struggles could balloon into large problems.

Clip from the movie 'Mean Girls':
https://youtu.be/re5veV2F7eY

In the movie 'Mean Girls', secrets and lies caused chaos and confusion and cost friendships...

"There are consequences -- large and small -- to keeping and telling secrets, whether among friends or through Facebook or YouTube."
- Terri Briseno, How can a secret hurt me?,
http://health.howstuffworks.com/mental-health/human-nature/behavior/secret-hurt-me1.htm

In this movie, a teenager struggled to fit in and dealt with some serious issues:

Movie 'Mean Girls'
http://www.youtube.com/watch?v=ewgggaTjx9Q