Does it mean anything when you sudden start having dreams about someone you haven't talked to in years?

[Hot Sauce Lover]

I used to talk to this guy from the time I was 13 until I was about 20.. It was always on and off, but we were really cool with each other and I always liked when we would start talking again. Anyways, the last time I heard from him was about 4 years ago now.. Last week I had a dream all night long about him.. The dreams were so vivid and intense that I kept waking up all night from them, every time I would fall back to sleep it would be a another dream about him.. Prior to that dream I haven't thought about him in a long time. After that I began to try to search for him on social media, but I couldn't find anything.I've had more dreams about him since then and now I just can't get him off my mind.. I try, but I just can't get my mind off him.. I don't know why. Before the dreams, I wasn't even thinking of him and now I can't stop!
Is there any meaning to this?