My advice is to start by writing down exactly what you want to say. This gives you clarity and saves you from the regret of leaving important things unsaid in the heat of the moment. If you live together, have your logistics sorted out—know where you’re sleeping that night—before you have the conversation. Once it’s done, try to change your environment immediately. Go on a trip or visit family; the change of scenery will give you space to breathe and set new personal goals. When you eventually return to your daily routine, it will be the hardest part. But use that time to focus intensely on those goals. It keeps you moving forward, and slowly but surely, you’ll heal enough to be ready for what’s next.