WC2, I have to disagree. Sure, some guys just fall back on it as an excuse, "yeah man, she was just a crazy *****.". But many people here have honestly experienced the hell. Realize that while it may seem that 3/4 of the guys in a thread will suddenly claim their ex was like this (way above statistical rate), there's a pretty obvious selection bias that draws people with such experiences to such threads.
There is the case of women that show low interest or disrespect because you're not the guy they really want. They treat you badly because they either don't care if they lose you, or know you can be walked over.
There are also women that are literally insane. They cannot maintain a legitimate relationship with anyone, but seem to make new best friends in a matter of minutes and find soulmates just as fast. They go from guy to guy, initially believing the guy is the greatest thing in the world (regardless of actual value) then one day just deciding he's scum out of the blue. These girls aren't low interest, they care very much if you leave, and will get more desperate than a crack ***** if they feel abandoned, yet see nothing wrong with cheating and never wanting to see you again two days after doing EVERYTHING to get you back.
These women will manipulate facts to always come out on top, and arguing is pointless because they truly believe their lies. These women can worship you one minute and want to murder you (and some will try) the next. A good sign that you're not imagining things is if your friends and even strangers stare at you with a 'did she just do that!?' look.
In some cases, these cluster B types seem to find the motivation to fake nice significantly longer than usual. Others just experience the love/hate cycle at a much slower pace, but either way I don't think you can say they can't hold anyone, at least long enough to really **** with them. Maybe you've just been lucky so far, maybe you somehow detect this sort of thing very fast and avoid them. However, NOBODY is DJ enough to really tame, control, or just civilize these women beyond temporary bursts, where they behave to suck you in. The only smart choice is to not play.