I have been dreaming about a girl I haven’t talked to in 3 years. Every dream is a memory of when we would hang out.
Dreaming of a person you haven't talked to in a while might indicate that you miss that person or that there is a part of yourself that wants to reconnect with them. In this dream, the fact that you are reliving memories of the times you spent together suggests that you may be longing for the good times you shared with this girl.
It is possible that these dreams are a reflection of your subconscious desire to reconnect with old friends or revisit fond memories from the past. Alternatively, it may be that you are experiencing a period of nostalgia and longing for the simpler times in your life when things seemed more carefree.