Simone feels insecure and needy in any relationship. She can switch from idolizing a person to completely disliking the person. She often threatens to kill herself and has engaged in self-mutilation on multiple occasions. In this case, Simone is most likely to be diagnosed with

I think that Simone is suffering from Bipolar disorder.

Bipolar disorder is defined as a brain disorder that causes unusual shifts in energy, mood, activity levels, and the ability to carry out every day tasks. It is also recognized as a mani-depressive illness wherein one minute you feel euphoric the next minute you fell depressed and tend to be suicidal.