I’m going to be blunt with you: Get the fuck out of there.
As Norman Osborn widely told his son Harry in the 2002 Spider-Man film regarding his relationship with Mary Jane: “Do what you need to with her, and then broom her fast.” It seems like this girlfriend of yours is a successful, upper-middle class woman and adept saleswoman. Good for her.
However, she’s also on a downward spiral. Cocaine does that to people. This bitch will tell you she loves you one minute and be sincere about it, and then sneak off with your wallet in the next to fuel her habit. As the aforementioned Osborn also told Harry about his late wife: “Your mother was beautiful. They’re all beautiful—until they’re snarling after your trust fund like a pack of ravening wolves.”
Your bitch sounds to me like a classic femme fatal, a hard-charging narcissist with a penchant for finer things in life that regular, working-class folks in America could only dream of (she lives in Toronto yes, but that’s besides the point, she still has more dough than most people).
Dump this broad, set her up in a therapy program for drug addicts, and move on your merry way. You don’t need this unrepentant, drug-addled, knee-jerk Trotskyite.
Also, see this excellent video on this subject for more, important information.
This may seem harsh, but sometimes bluntness is a virtuous necessity.