Looking for help..with marriage please?

My husband wants me to either sleep with another man while he watches or he wants to cheat.. and I'm really upset..we used to have an open relationship..but we stopped doing that. He's always been very rough with me intimately which was okay. But not things have gotten worse he demands and he takes..without asking most of the time..and now he wants to bring this black guy from work home..to watch screw me. I'm just not sure if I should leave or not..things have gotten out of hand. He brings women home too. I've always gave him everything he wanted..isn't that my roll? But things are getting hard.