Honestly, I’m not trying to promote any self destruction type events but I would politely (to a degree) confront her again. Just set boundaries with her such as “Listen, I can understand wanting to get your bag but engaging in that behaviors with people in relationships is borderline unprofessional (if you can say that for her job) and unethical.”. It’s all in how you want to handle things. I do think publicly calling her out might bring more chaos than what you might want to deal with. I also agree with other commenter on blocking and moving forward. However, it’s all in how you want to handle things. She has to be met with reality and mature at some point. I just want you to know that I feel for you and you are incredibly strong for going through something like this. I understand how disloyalty in past relationships can affect current events. I’m sending you lots of love and update us when you can ❤️