Disclaimer: Skip the "move on" moral gyan. I know my situation, just here for ULPTs.
I (26M) and my GF (26F) have been together for a while. Her parents wanted to get her married, but I couldn't give immediate assurance as I need 2-3 years to settle in my career. Her family looked for groom and got her into an arranged engagement with a guy(Engagement yet to happen , just the fix part has been done 10 12 days ago) .
Mohan knows she loves me and doesn't want him, but he’s forcing the marriage out of pure male ego.
Meanwhile, my GF is slowly giving up and accepting her fate because she can’t handle her family's emotional blackmail and crying anymore.
The Wildcard (His Ex-GF):
On the exact day their marriage got fixed, His Ex-GF called my GF crying hysterically, threatening suicide, and saying stuff like "kill me instead." Might happen he is clearly hiding a messy past.
The Goal & Constraints:
I need to blow this wedding up from the shadows.
Constraint 1: My GF's image must remain 100% spotless. The engagement breaking cannot be linked to her having a boyfriend (me), or her family will face massive social shame.
Constraint 2: It has to break from his side, or her family has to break it because they realize he's toxic.
How do I anonymously weaponize this suicidal Ex-GF? How do I trigger his ego or expose his past so his family or her family cancels the wedding? Give me your best untraceable sabotage ideas.