Do we know, beyond a reasonable doubt, he did it? Conspiracy theory here.
Perhaps she said fuk you i'm out of here, after meeting someone who said they were very interested in her latest venture and wanted to help make her a popular social media face.
Said person kills her, while the "now missing boyfriend is bound to a tree, watching. As they torture her, always reminding hime, he's next.
They cut him loose, telling him. We know where you live, as well as his family. He's all stockholm syndrome'd out and too scared to say anything. It's happened before .
OR the baby faced bf is a serial killer, who offed the lesbian couple , while she video taped it.
Then decided, when she started having doubts about the killings. Went all Early Grayce on her.