oh if it only were that easy... 'unhappy with dh... pack up kids and go'.
I can't really complain about dh , except for the odd day/phase when he has his 'dark' moments which I had a struggle with not too long ago, but I've learned to live with it. I've got my moods so he can have his, well to a certain degree even.
He has most definitely changed over the years, mainly since we've had kids (both not planned, we alledgedly both were supposed to have problems conceiving). Part of the 'problem' ... sleep deprivation, lack of money, added responsibilties etc.
Also I do firmly believe there are 'blokes' out there who do change after the vows have been exchanged a la 'snare them first and then let them have it'. Not many probably but itonly takes a few rotten eggs to spoil the male image imho.
As for why stick with a man who neglects/abuses/disrespects... maybe it's fear of being alone and not knowing how to cope on your own, e.g. for when there's no family network to help you out (like in my case I have no family in this country!); fear of financial hardship, lack of self esteem... there are so many nuances to this, it can't simply be judged in black & white.
I personally would up and go if dh would turn violent and dare lay hand on either me or the kids. As they say... the most dangerous place in the world is between a mother and her child.