One Lover is not enough(2002)

Anna's fatal liason with consequences...

One Lover is not Enough is a German thriller about Anna, a married woman who begins an affair with Lars, a pharmaceutical representative—and the husband of her best friend Bettina. When the pair witnesses a murder at a luxury hotel, Anna's brother Max becomes the prime suspect. To save him without exposing her infidelity, Anna must navigate a dangerous web of blackmail and deception. Bettina, with her connections through a wellness empire, helps secure Max's release, but clearing his name requires Anna's testimony—which would reveal everything. As the stakes escalate, Anna faces an impossible choice between family loyalty and protecting her secret, leading to increasingly dark consequences for everyone involved.