What is the tittle of this gang and revenge movie?

This movie was made in the 90s. The plot was about a series of murder of men by stabbing. The two main characters are a couple. It turns out that the woman was the killer of all those men because in the past when she was in the army/police force (i cant remember), she was gang d by her colleagues/comrades. She had amnesia about the event after that but subconsciously, during the night, she has a split personality and searched for those men that d her and killed them. She has a set of knives, each would be accounted for one murder. Does anyone know this movie? I'll post more details if I can remember.