<human>: So my friend we'll call Mark is head over heels for this girl who we'll call Stacy and has been for over a year. The problem is that Stacy is a human monster, she is ignorant, selfish, and unapologetically dumb. The worst part however is she knows how obsessed Mark is yet continues to lead him on, she'll say stuff to him like "I really like you but I'm just not ready for US" which would be fine if I didn't know she was doing it to keep him on a leash

Her best friend, we'll call Lynn, is my on-again-off-again GF/BFF's sister, I have known Lynn for 5 years now and we are very close. So when I came to her asking about the nature of Mark and Stacy's relationship she showed me some of her and Stacy's Skype logs where Stacy literally said "I think it's cute how he dotes on me, I'd never date him, but he's nice to have around." 

My issue is that Mark refuses to listen to me or let me show him proof, he's convinced I'm just jealous of her. My last resort at this point is to somehow drive her off which I fear may ruin my friendship with Mark. Me and the rest of me and Mark's friends have agreed to work together on this goal. 

Is this the right thing to do? Should I risk our friendship for his well-being? 

Oh and when I say dumb I mean can't read a thermostat or an analog clock, and I CANNOT make this up, literally thought that Hitler mass murdered Aryans, she knew what an Aryan was, somehow got the rest of it wrong.

Can you condense the text into a few key points?
<bot>: My friend is obsessed with a human monster and I want to break them apart but don't know if it's worth risking our friendship, or if it's a reasonable thing to do.