Before I met my wife, she was in a relationship as you describe. A friend of hers, with bible in hand, talked her into putting her trust in God to gain faith in herself. It was very painfull for her, but she broke up with him.
Months after, she and I met and we later married.
You see, I had broken up with a controlling and abusive woman at about the same time (I didn't let the relationship get all that far). My wife and I know what the darkside is like, and we thank God we met.