I wasn't always what you call a "jackass". A long string of women turned me into one. Blame your sisters.
This sounds like a "fool me once, shame on you. fool me twice, shame on me" situation.
You only get to blame the first one. After that, it's your own fault for not learning from past mistakes and continuing to choose poorly.
Note this applies equally to women who blame the entire male gender for their repeated poor choices of partners.
or maybe these "insane" girls are sane and he is the insane one..
You know the cardinal rule about women, right? Hot, single, sane. Pick two.
Funny.. but that defies logic since in order to be not single they must have had to be single at one point.. thus if they are hot and sane then they must have been single before thus rule broken...
Yeah, but at 44, it's tricky dating the 18 year-olds. Tricky, but not impossible

Basically what I am saying is that you usually only have three choices:
1) Steal a girl away from some other guy (a little dangerous, and if the girl will trade up to you, she will also likely trade up from you).
2) Take a homely girl, give her a makeover and take her to the gym. This is a lot of work and she can dump you for another guy after you made her hot.
3) Have insane hot sex with the crazy ones and then kick 'em to the curb sticky broke and confused.
Obviously I prefer method three.