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Tortured actor Philip Seymour Hoffman was trapped in a love triangle before he died, according to his private diaries.

The Oscar winner was “caught in between” his relationship with longtime girlfriend Mimi O’Donnell and a woman with whom he he’d recently hooked up, according to his journals, law-enforcement sources told The Post on Tuesday.

Hoffman implied that his new gal pal was one reason O’Donnell — the mother of his three young children — might have bounced him from their Jane Street pad about three months ago, sources said.

O’Donnell also didn’t want the drug-addled Hoffman living with her and their kids while he was still using, sources have said. She hoped the tough love would make him get clean faster.

The 46-year-old “Capote’’ star — who died of an apparent heroin overdose Feb. 2 — also painfully wrote about the addiction that would eventually kill him, the sources said.

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He felt “ashamed that he was going out and hanging out and drinking” after having been sober for so long, sources said.

Go to The Post for more.