Why would he cry but won't talk to me?

My ex and I broke up about a month ago. Since then I haven't seen or talked to him giving him space but last night there was a concert I really wanted to go to so I went knowing I might see him. I asked him if we could talk and he said later but we never did. But later I found out from mutual friends that he was crying after seeing me yesterday. I don't understand why he wouldn't speak to me and now I'm trying to decide if I should box up all his things and send them back to him
Why would he cry but won't talk to me?
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