In short, he sent the coin to another wallet. On the message you sent your address to him, is it your bitcoin address that is there? ItIf it is your bitcoin address that you sent to him seen in the message, that means it was not your fault but your friend's fault. He has to send another coin to you because he sent it to the wrong address. Maybe your friend copied a wrong address or hehis device has clipboard malware.

In short, he sent the coin to another wallet. On the message you sent your address to him, is it your bitcoin address that is there? It is your bitcoin address that you sent to him seen in the message, that means it was not your fault but your friend's fault. He has to send another coin to you because he sent it to the wrong address. Maybe your friend copied a wrong address or he device has clipboard malware.