Your Name is Justine(2005)

While living with her grandmother in Poland, a young woman falls in love. Her boyfriend is charming and suggests they travel around Europe and work here and there to pay for their trip. Unfortunately, the boyfriend isn't as he seems and the young woman is sold as a prostitute when they cross over to Germany. We follow her ordeal as she tries to free herself and stay sane as time goes by and her captors try to break and condition her to a new life of servitude.