The "Without Me" singer teams up with the marshmello-helmeted DJ and producer on the tune, a self-empowerment anthem which scrutinizes the extra-curricular activities of a partner.
On it, she sings: "I don't know why you hide from the one/ And close your eyes to the one/ Mess up and lie to the one that you love/ When you know you can cry to the one/ Always confide in the one/ You can be kind to the one that you love."
READ MOREA Collaboration From Marshmello & Halsey Is on the Way: See When It's DroppingThe new track dropped early Friday and is 'Mello's followup to "Been Thru This Before" with Southside and Saint Jhn, which arrived last month.
It feels like a lifetime since Halsey arrived in the big league via her collaboration with another EDM act The Chainsmokers, on 2016's "Closer." She released a pair of "You Should Be Sad" remixes by Tiësto and Mike Mago in March.