Why is this type of behavior occurring?

My ex will not talk to me at all. I thought we were going to remain friends. He was so in love and now he's cut off all contact with me. He will not give me my belongings either. He gave me an expensive gift via mail which he purchased before the break up. I don't understand why he is completely ignoring me and won't give my things back.
Why is this type of behavior occurring?
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