Please help find indie movie

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Based on the truth.. and lies.
I saw this movie on tv i think it was on sundance between 2008-12
what i remember is a guy trying to save his girlfriend or sister and she was a stripper and she was either being beat or she had some kind of disease because her back was all tore up and red, he was trying to be a drug dealer to save her to give her enough money to get out of stripping.

there was a couple different plots the other i remember was the was these three young girls and there dirty, they talked dirty and they would flirt with there teacher to get rides and he would give them drugs towards the end of the movie he tried to rape one of the girls in the car and she ended up hitting him over the head with something, and then an the end i believe one of the girls gets hit by a car.

PLEASE HELP