Hell hath no fury like Brandi Glanville scorned.

The Real Housewives of Beverly Hills star apparently has very strong feelings about cheating -- especially after ex Eddie Cibrian's extramarital antics led to him leaving her for LeAnn Rimes.

On this occasion, it wasn't Brandi herself who'd been two-timed, but rather a "beautiful" friend who found her husband, and father of her four kids, in a compromising position with the family's 19-year-old nanny.

"I want to MURDER him! F*cking men!!” the mercurial Bravo beauty tweeted of her friend's husband, later asking, “Men please tell me why if you have a beautiful happy family u just can’t find a way to be with the 1 woman that created that family with u??

"I want to put his f***ing name on Twitter but I love his wife &family 2much. I’m the last gf she told cuz she knew I wud lose it! #murder.”

Challenged by a follower who reminded her it takes two to Tango -- and that the nanny should be held accountable for playing her part in the adultery -- Brandi responded, “Agree but at 19 with no kids I mainly blame him. She cared for those kids also so its even more disgusting!”