Hi... You need to figure out if you have any repressed thoughts/feelings about that person or you need to focus on something related to that person. If that person is completely off your present life and has no business with you at present, this dream might be a reflection of something in your subconscious mind and this person is merely an image.
Next Steps
Consult a Psychologist.
Dream Analysis along with Interpersonal Relationship Counselling is required.
Health Tips
Mr. Gunjan Maithil
Senior Psychologist
Cell: nine six seven one three zero three one three four
Website: https://gunjanmaithil.wixsite.com/therapy
App: http://wix.to/fECHB08?ref=cl