"Cyrus is really upset with Hemsworth. She took off her engagement ring to make him mad. But they are still together. Cyrus is crazy about Hemsworth, but sometimes she doesn't treat him great. She likes things her way and tends to play games. And that's the reason they fight," the source added.
The 23-year-old actor was recently said to have been cheating on Cyrus with January Jones, 35.