What does it mean if you keep on looking for someone in your dream?

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I keep on having this dream..i keep on looking for this certain person in places in my dreams...sometimes i even try to make a call when i see a phone in my dream...i always have this intense feeling that i really need to find him that when i awake i'm so tired and exhausted...sometimes i find him, sometimes i don't...he is friend back then but we haven't been in touch for almost 10 years now...