I've been reading how Amber Heard tried to control Johnny Depp through threats if suicide:

https://www.google.com/amp/s/pagesix.com/2022/04/20/johnny-depp-claims-amber-heard-would-threaten-suicide/amp/

Though my ex-wife was never physically abusive (only emotionally and sexually), she too made extensive use of suicide threats to keep me in the relationship.

How commonly do abusive women use this tactic, why do they believe it works, why does it often work, and what can we do to make men more resistant to this tactic?