Stop living like you can't be replaced, you're very replaceable.
If someone is done with you then they do not want to see or hear from you again, and they are cutting you out of their life for good. This is not a nice feeling, especially if you want to continue the current relationship. If someone tells you they are done with you then they probably will not answer your calls or emails, and they will probably remove you as a friend on social media applications as well.