Dreams usually need to be interpreted as symbols, they are not to be interpreted literally. In this case, your friend most likely does not represent himself at all. You say he is an old schoomate. Perhaps he represents your past. Is there some issue from your past that is causing you stress? You also say that you were at a party where you didn't know anyone but him, so he may be interpreted as a source of confort in a lonely environment. This is far-fetched but maybe he represents someone you trust or trusted that hurt you in some way.

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