^ I feel that. I like a lil caliente, myself. As it goes though, crazy women are great...until they suddenly aren't. *shrugs*
As to the op... unfortunately, that's how it goes. Or maybe fortunately for the stable people in the world. I see more unhinged/damaged/crazy people partnering up than you do worthwhile people... but are those relationships good ones? Are they stable, satisfying, worth having? Prolly not. I've seen no shortage of crazy folks partner up with other crazy folks. Sure they aren't alone anymore, but is it better than being single? Doubt it.
I do understand why it's frustrating and upsetting. You can do everything right and still get the short end of the stick. It can be hard to understand that you're actually dodging bullets when you watch what appears to be good stuff happening to less than great people. Personally, I can't stand that crap. I root for the good ones. Sorry this will be a hit on your friend. That sucks and I wish her well in this. Good on you for looking out for her, for thinking of her.