Just say “ oh I assumed it was meant for someone else and you texted me by mistake.”.
Active listening and validation provide easy replies to his statements. "I miss you" is expressing a feeling. I don't see acknowledging feelings as a weakness. Direct questions are different.
Originally Posted by Imaginary Dialogue
Him> I miss you You> I hear you. | You do sound upset. ... Him> I want to work on things. You> What things do you want to work on?