Why do I always dream of a person whom I've forgotten long long time ago?

ANSWER:

Dream is only a dream that our subconscious is trying to make some sense to what you just did on that day, or it could have something to do with you thinking about this old friend all of a sadden. Most of us when we have a bad day or even just finish having an argument with someone. Because you got upset with someone, your mind and feelings got affected by it and it will give you something to think about before you fall asleep.. and that is the explanation about your dream..