Miller, real name Malcolm McCormick, was 26 when he died from a suspected overdose.
Grande and Miller dated for two years.
"I have cared for him and tried to support his sobriety & prayed for his balance for years (and always will of course) but shaming/blaming women for a man's inability to keep his shit together is a very major problem", she wrote.
Ari has finally broken her silence over her Mac Miller's death.
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The singer made her first statement on his death in the caption below, explaining that she "can't wrap my head around it", despite the two frequently discussing the possibility when Miller was alive.
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Grande took to her Instagram on Friday to express her sorrow over the loss of Miller, who died at his home in California's San Fernando Valley on September 7.
"We talked about this", Grande continued.
'I adored you from the day i met you when i was nineteen and i always will. "I don't want to be depressed", he said. I saw that, I was around it, I took phone calls from her - 'How do I help?' 'What do I do?'