He says we can't be friends. Why?

He says he's over me but we can't be friends. However, he still would like texts and to catch up. He did mention that seeing me would be difficult and so would communication. Just hearing my voice brings 'it all back.' He's on a rebound who he's only known for four weeks. When we bump into each other, he can barely look at me but steals glances when I'm not looking. I'm friends with my old ex because I'm completely over him. I feel nothing bit friendship for him.

I don't under my ex's feelings?

Why can't we be friends? Especially when he told me he cares for me.

He says we can't be friends. Why?
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