Grande, whom Miller dated for two years, alluded to his issues in her post, adding, “we talked about this. so many times.”
“I’m so sorry I couldn’t fix or take your pain away,” she wrote. “I really wanted to. the kindest, sweetest soul with demons he never deserved.”
Along with her tribute, Grande shared a video of herself with Miller on an undisclosed date.
In the video, Miller suddenly becomes aware that Grande is filming him and begins laughing.
“Baby, stop,” he says, putting his hand in front of her camera and then covering his face with the hood of his sweatshirt while laughing.
“It makes me happy,” she says.
Grande is currently engaged to “Saturday Night Live” cast member Pete Davidson.
“I hope you’re okay now. Rest,” Grande concluded.