Thank you for all your responses. It is fascinating how many of you do not seem damaged by your parents' splits. I know my niece certainly has been bitter for all of her life since the break of her parents when she was in her teens (she is 32 now.)
(I am working through answers as I've been offline doing bedtime routine for a couple of hours.. )
@Procrastinating (and others) - that is a problem I see all around me, the step parents. Maybe not the actual break up but the new relationships. Sometimes a new love seems to take over one's love for one's children. I have even seen a mother move to a new country to be with a new partner, leaving a child behind for monthly visits. That has been hell for al involved.
I do also know examples of couples who have split but live in the same town with new partners and all are happy. there are now stepsiblings on both sides and they are all one big happy family. But I think that's a bit rare..
Interesting that some people are saying the divorce didn't damage them but the aftermath did. As if the divorce didn't lead to the aftermath?
When I look at our situation, I know beyond a doubt that my H will not live more than a few years if we split up. Without me as jail warden, he would be free to fraternise with any scum he likes, drink and maybe even take up drugs, who knows. He was never a druggie before, and despite being in a band with a junkie, his drug of choice was always alcohol. But without me he would be a total mess. I am fairly sure that if we hadn't met he would even be dead by now (he is 50.). Every time he has been to hospital it has been because I've taken him or called the ambulance. He would never take that initiative. (early on, mental health and 3 times for heart failure, the last 2 after stopping drinking for 2.5 years).
I guess people - or dare I say women - really change when they have children. the man who may have once been a fun partner suddenly seems like a loser in the face of the realities and responsibilities of life. Yes, DD was planned, but I don't think we thought it through. Before his heart trouble DH did do a lot of childcare while I worked. But after my redundancy he did less and less. Then he got ill.
I really do not want to see my daughter with someone like that. I want her to have a partner who works, for a start. And no, of course I would not want to see her unhappy. But even men who work, they can still be awful, abusive, controlling. I really can't think of a man who isn't in some way a total nightmare to live with. Sorry. I guess I only know dickheads.
(sorry this is getting long...)
I guess the people who survived divorce unscathed had 2 functioning parents. I'm not entirely sure I'm functioning any more, and DH certainly isn't and wouldn't be if we split. I think one of the things that stopped me leaving 5 years ago was that it wouldn't be a case of him having DD at weekends or sharing the care - it would be on my own, full stop. And no family nearby.
My DH's drinking stopped after the first heart failure. But he seems to have taken it up again since his father died 6 months ago. Taken it up only occassionally; I was not aware as it only happened when I was out of town (until last weekend). I have requested it be nipped in the bu. No way can I go through some of the incidents we used to go through. he can not have 'just one'. It is zero tolerance, that is what I am saying. BUt even when not drinking, he has let DD down a lot. Saying he would do stuff with her and then just staying in bed. It makes me so angry. I have to explain he is illl blah blah blah. She just worked out the other week that he gets DLA; she asked "Do you get money for being sick?" and I was horrified, I do not want her to see that as a lifestyle choice. I desperately want to be back in work myself, I worked all my life since I was 16 while studying. Not that it is his choice, he really is too ill to work.
Ok I am going to stop waffling now.. but thank you all for your answers. it is not an easy decision for anyone to make.