男は彼女のルームメイトをクソによって彼の浮気ガールフレンドに戻って取得します

Sasha's roommate is convinced that she's cheating on her boyfriend Zane, so Beca calls him over to investigate. When they find evidence that Sasha is being unfaithful, they decide to get some revenge by having Zane cheat on her back.