Caught my girlfriend cheating on me and my late husband

So my late husband, alter, and my girlfriend just like I thought was cheating. I found all the proof on her cell phone. She had been sending her ex text messages for MONTHS! She tried to tell me that her cousin had done it on her cell phone. That it had not been her. She swore up and down that it was not her, but her cousin. I knew this wasn't true because her cousin had only briefly met me twice. She said her cousin had done this to ruin our relationship. Just because I would not give her something that she wanted of my late husband's. My girlfriend stupidly left her phone with no lock on it constantly. She said that her cousin had done the text messages when she left her phone unattended. Sure, he er cousin sent text messages to her ex repeatedly over a course of 5 months. My late husband, alter, and I were polyamorous. This means that five months ago she was cheating on my husband too when he was very sick, but still alive. He passed away thinking that our girlfriend loved him. Well, when I found out I confronted her about cheating on my passed husband, alter and self. I gave her a second chance. But I couldn't believe her fully when she said that it was her cousin. Because like I said I don't know her cousin very well. Why would her cousin do that!? The text messages also stated to her ex that she was trying to get me hooked up with somebody else in an lgbtqia support group that we both were in together! Nothing was adding up that she was telling me. She still swears up and down that she wasn't cheating, but yet she broke up with me because I called her out. She also tried to shove me and a friend of mine who got between us trying to read on n with her. She literally shoved and tried to harm two physically and mentally disabled people. She thought she could get away with it. I'm getting a protection order against her obviously. I'm getting her removed from all of my food stamps, bills, HUD and my lease. I legally have to give her 30 days eviction notice. (Landlord said I had to because I am head of lease and what not.) Our girlfriend's moving back to Arkansas tonight. That's her problem. Not mine.🤷‍♀️ She did this to herself. She broke up with me because I caught her. She attacked me and my friend because of that. She also went to the hospital under police travel. They were doing a psych evaluation because she threatened to kill herself. She went out to the yard plopped on the ground in the front yard and started to try and swallow all of her pills. The police stopped her. She cussed them out. After 30 minutes of being at the hospital, she left. They apparently said she was okay enough to leave. She came back to my new place and got a good chunk of her things with the police. I told her she was not welcome here anymore. I had called the landlord and I was getting her taken off of everything. She broke up with me. My alter and I was not going to stay with somebody who is going to mentally and verbally abuse us. I was not going to let her hurt my friends because they weren't going to let her hurt me.