My ex-girlfriend texted me that she missed me. How to reply would be more appropriate?

Don't put all your eggs in one basket to ask others for brevity, don't lose face, just reply "since you think about it, I agree." You don't have to bless each other or be friends when you break up. From then on, we didn't know each other and never saw each other again. " Don't make her rude. She dumped you. Let her know that you can't live without her.