"And that's all part of the beauty of turning whatever things you've gone through into a story. I find that to be very cathartic. I remember learning that in grad school, our teacher said all the insecurities, all the dark stuff you get to use that and that's really the truth," Cooper told Variety at the Toronto International Film Festival premiere.
The actor also features in the movie, which is generating Oscar buzz, as Jackson Maine, a rocker struggling with alcoholism and drug addiction who falls in love with his musical protege Ally (played by Lady Gaga).
In a 2016 interview with Barbara Walters, Cooper revealed his battles with alcohol and substance abuse.
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