Lyric discussion by xpsychicheartsx 

it could be about friendship, past lover, girlfriend, past family member

..somebody that at one point you knew, after years of not talking or seeing each other, they call you out of the blue reaching out to you

he's willing to listen to you and be there, which shows that he does care.. but he questions what value his input would do, considering it's been years and he wasn't so sure he even knew back then

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