maybe it's about him and a friend using drugs together, even though the friend said he was going to quit, hence
"if you're all done like you said you'd be"
but since the friend is still hanging around the speaker who still uses, the friend doesn't quit because it's right there.
maybe the speaker is angry that the friend is falling back on their promise to stop because he wants to see them get better, even if he cant
maybe it's about him and a friend using drugs together, even though the friend said he was going to quit, hence "if you're all done like you said you'd be"
but since the friend is still hanging around the speaker who still uses, the friend doesn't quit because it's right there.
maybe the speaker is angry that the friend is falling back on their promise to stop because he wants to see them get better, even if he cant