Why does ex want to be friends so badly?

Ex of a year wants to be friends after 3 weeks or 4 following a break up. We have been in touch and plan to meet but his insistence on being friends and desire to see where our friendship goes concerns me as he kept insisting I should move on but when I started to he got very upset and then seemed hesitant to be friends. We discussed friends with benefits and he said he could not separate emotions from it. What could the meeting in person soon mean and why does he want to be friends so badly? He won't let me move on.

Why does ex want to be friends so badly?
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