How do I reply to my ex?

My ex emailed me that he misses me and he wants to meet up sometime this week but if i didn't want to he would understand.

To be quite honest, i dont want anything to do with him. Would it be rude if I ignored the email, or should I reply? If I reply, i dont want to open a "gateway" for him to start talking to me again.
How do I reply to my ex?
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