Hi, everyone. I share an office with someone with BPD. We used to be close friends, but as her BPD reared its ugly head, the abuse and manipulation she doled out became to much. We fought a lot, and eventually, we ended the friendship. We've continued to share an office, which has not exactly been a cakewalk. At one point, she wanted to talk to "make amends." At the time, I was still so hurt by her and angry and desperate to move on that I shot her down and told her there were no amends to make. However, I'm making strides in my own life and am growing and changing as a person. I've been thinking that it might be a good thing to have a conversation. But I wondered if anyone here could help me with a few issues, since I want this to be calm, compassionate, and mature. 

1. How on earth do I even begin? 

2. How do I make it clear that this is not a renewed friendship, but a step toward a better work environment? 

Thanks in advance! 