Lyric discussion by iredpoet 

Cover art for Follow You lyrics by Bring Me the Horizon

Oli said he had written this song a few years back and found it while digging for material for TTS.

In the album commentary, he says it was written when him "and [his] other half were going through a particularly rough patch" (his other half being his longtime girlfriend, now wife, Hannah). In his words, it was a sort of apology for his behavior and his show of devotion to her.

So no, it's about a person (pretty rare for Oli because he tries to be general in most songs) and not drugs or whatever.

My Interpretation