can someone tell me what my dreams of an old ex means please!!

hi everyone

i hope you can clarify this me and my ex split up 3-4 yrs ago and i am over him totally and have moved on but i last seen him at the beginning of this year in a club and then last month i had a dream of him adding me on msn and he talking to me about his family and asking how i am and hows my family etc... then i seen one of his closest friend 3 wks ago in a shop and then i had a dream last night about him he pm me on msn and asking me where ive been as i havent been on for a while and then he was telling me he seen some of my familymembers in a shop and he was asking about my family etc....

what i dont understand is why he come into my dreams all of a sudden and why ? when i havent even thought about him all these years.

i hope some one can help me understand my dream and what it trying to tell me !!

xx