The feelings are not necessarily about that person, could be about what that person "means". For example, a lot of people dream of celebrities; I had a dream about Elton John, borrowed a pair of white glasses from him, they went with my cow outfit and later he used a machine gun to cut down a wooden fence between two properties :-) but I have never particularly liked Elton John. So the person could be a symbol of something else.

What do you and this person do together in real life? What are some of the individual dreams? That you are friends could be part of the key to the dreams; he's a known, common entity in all the dreams so he could just be tying all the dreams together in some way or showing you that whatever they are each about is something "friendly", something you should care or have feelings about, that sort of thing.