These lines introduce the character across from the narrator. From the lyrics on the other songs, he is a childhood best-friend of the narrator, to whom the narrator was very close.
He grew out his hair, so so did the narrator, but the two grew apart, he cut his hair, and the narrator never connected with him again. They grew up, they grew apart.
His friend was always anxious about the suburbs tearing them apart, how it might change them. Perhaps they thought that the suburbs would take away their identity, that they would end up having to fight it.
Eventually a suburban war does happen, but they were on opposite shores (sides).
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