Most Helpful Guy
Your answer is in your title and question.
He misses you but will not meet up. Means just that. Or to further elaborate, he means, he misses you but has no desire to see you in person... reasons might be:
He's afraid he might catch feelings upon seeing you.
He doesn't want a hook up to potentially happen.
He misses what you once had but has no desire to get that back fully.
Who know eh.
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Most Helpful Girl
It means he misses you but doesn't think that he should get back together with you.