Question: Did I do the right thing by leaving instead of confronting her? Since she is still dating this guy, I am assuming she would have ended up dumping me. I thought it would be better to leave and regain her respect. A year before she said she lost respect for me when I wasn't working. Any opinions?
I'm not sure what you plan to gain by either leaving a second note or meeting up in the future to talk things out. Are you looking for an apology, for her to see the light, to effect change? My experience with my ex is that confronting someone with BPD will likely result in none of that. Besides, if you did get back together, what prevents her from cheating on you again or turning around and dumping you in revenge. At least you left with your pride intact.
My personal opinion is you did the right thing by taking the high-road, so unless she admits she needs help, best to leave it at that.