His mom sounds like an angel, I'm happy to hear she gave you her support. Idk if confronting him at this point is even relevant, I'd just make sure everyone is aware that this man calling you slurs actually did physical things with you, something that a straight man could never do. I may be horrible, but I would make sure everyone knows about every kiss, every hug, everything sexual that may have happened. I'd even show people pics and texts. I know it sounds terrible, but it would shift the tables in exactly 3 seconds.