Halsey called out a biphobic troll who said Miley Cyrus' bisexuality is to blame for her breakup with Liam Hemsworth.

As previously reported, the "Nothing Breaks Like a Heart" singer's representative confirmed the longtime couple's separation after less than one year of marriage in a statement to People on Saturday (August 10).

"Liam and Miley have agreed to separate at this time," the rep said. "Ever-evolving, changing as partners and individuals, they have decided this is what’s best while they both focus on themselves and careers."

Shortly after the news was announced, Cyrus was spotted kissing Brody Jenner's ex-wife Kaitlynn Carter on a boat during their vacation getaway in Italy. The PDA-filled photos led some fans to believe this new relationship might be the reason Cyrus and Hemsworth called it quits. In fact, one Twitter user even accused the pop star of cheating, adding that her sexuality is to blame because bisexual people are "greedy and never satisfied."

"#MileyCyrus splitting and allegedly cheating on Liam with a woman confirms that you shouldn’t date bi people. Not offensive, just true. Bi is greedy and never satisfied," the person wrote.

Halsey, who identifies as bisexual, saw the tweet and quickly defended Cyrus.

"Doesn’t surprise me that ur saying this and ur page has u crying about Brie Larson too!" she wrote. "Stop being afraid of women who aren’t afraid to do what pleases them and not other people."

The "Without Me" singer then had to defend herself from a troll who accused her of "acting bi" even though she's only ever been in relationships with men. Once again, Halsey put the person in their place, making it clear she has absolutely nothing to prove.

"bold of u to assume I haven’t been intimate with most of the women 'on my side,'" she clapped back.

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