How Do You Handle The Debbie Downers?

How do you handle the people who are constantly telling you the "obvious"? "He s not good for you" or "He s unstable" or "This will never work out" or "Are you sure he isn t cheating on you" or whatever other obnoxious question and badgering session that it brings? I recognize that my family and friends have concerns for me. I know that this relationship is difficult. Most of this stems from my BF s Facebook, from which he blocked me. I don t care. He has bigger issues right now than... How Do You Handle The Debbie Downers?
https://www.myptsd.com/c/threads/how-do-you-handle-the-debbie-downers.55400/