Haraam relationship

I am currently in a relationship with a man that has promised myself and his family that he will marry me for over a year. We are still unmarried but now have a baby together and live together under the same roof. Many people have told him to get married and he doesn't listen. Im still waiting. If we are to eventually marry what would I do to repent these sins. I fear for my newborn baby as she has now been born haram. I want to do everything I can to make sure she is protected.