3. "I need time to make up my mind."
Cheaters don’t. It’s crazy of him to think that you should obediently sit and wait for him to decide what to do next. Your life is more important. Why would you dedicate your precious life to someone who doesn’t deserve your time?
How do you respond? “How is it possible to be a partner and, at the same time, still in doubt whether you want me in your life or not? I am not into competing trying to convince you that you need me. You see the door. Feel free to leave me. I'm ready to move on without you.”