Kat Von D Says Jesse James is "Toxic," Cheated on Her 19 Times

Kat Von D does not hold back in a scathing Facebook post about Jesse James.

She says Sandra Bullock's ex cheated on her as well ... 19 times to be exact.

Moreover, the tattoo artiste says she ran into the 19th girl James that nailed during their relationship, which ended in September: "Today I encountered the 19th girl on the list of people Jesse cheated on me with during this last year," Kat's post began.

“I kept going back and forth in my mind as to what the best way would be for me to let go of and release residual feelings remaining from that toxic relationship." 

Adds Von D, who ended her engagement to James this fall, "All of this may sound petty or immature, but I assure you this is coming from a place of honesty and love.”

Kat says she tried to prove people wrong after Jesse was outed for cheating with Michelle McGee and many others, ruining his marriage to Sandra Bullock.

“There was a time when I was confident and excited at proving the world wrong, because I believed so deeply in people's ability to change,” she wrote.

“Although this was not the primary purpose of the relationship, I did feel like it would be positive for those who judged Jesse solely based on what they read in tabloids, to see that change is always possible - even in people who seem hopeless.”

It wasn't to be, apparently. Kat's now calling Jesse out herself:

“I think it just makes me sad to imagine him in that dark place - where seeking validation through the attention of women takes precedence over being a good father, a sincere friend, a better coworker, and a happy individual,” she wrote.

OUCH!

“I tried my best to go through all of this without venting, or complaining, or fueling more tabloid mumbo jumbo - but this isn't about any of that. This is about me making peace with myself, forgiving myself for making some bad mistakes.”

Kat even thanks Jesse for the lesson he forced her to learn.

“Time is something you can never get back, and what we do with this very present moment is the most real thing we have. So if that's the lesson Jesse forced me to face and learn by all of this, than all I can say is Thank You,” she wrote.

The 29-year-old ends her missive by saying: “It would be nice to move on now, and kindly thank you all in advance for your support, love, and positivity.”

Now if she could just get that Jesse James tattoo removed ...