Hi OP just to answer your question about my dc, I suppose I'm quite lucky in that they are both still quite young. The baby hasn't really cared. The 3 year old, to be honest, did play up for a couple of weeks, but there were some other changes going on when we split like me going back to work and I think it was that as much as anything. I'll be honest I had about 3 weeks where it was really fucking stressful, but I still never questioned my decision. It was helped by him acting like a dick, which actually just helped to cement it. I was also surprised at how quickly I adjusted to life as a single parent. I felt lonely for one night and that was about it. Again, it helped that I'd done so much alone with the kids anyway that suddenly doing everything actually wasn't that much of a change.
As regards how I felt, I honestly didn't feel any guilt. Partly I suppose because I felt, and still feel strongly that it was his behaviour that ended the relationship, so although it was ultimately my decision I don't actually feel that responsible. The most overwhelming feeling was relief. All the uncertainty, all the worrying and anxiety about the future, all the wondering about whether we could make it work and the mental energy that was taking up was suddenly lifted. Making the decision made my future suddenly seem brighter and full of possibilities. I started to feel like myself again. I started to realise how much he'd worn me down over the years and I'm now starting to get my confidence back.
The situation many of you are describing here feels so familiar. I know making the mental leap of deciding not to be together is so so huge. I couldn't face it for ages. The thought of selling the house, splitting up all the stuff we'd acquired together over the years, the thought of dc growing up with two homes. I simply couldn't think about it. All I can say is that once you get past that and accept that it's all going to happen no matter what, it does just get so much easier. And it doesn't seem so huge. It doesn't happen all at once. You just deal with one thing at a time. Yes, I do feel sad about my children but I know I am making this decision for them as well. I wouldn't want them to stay in a situation where they were chronically unhappy, so I don't feel that I should either. My parents split and it was hard, but they both ended up with people so much more suited to them and they were so much happier as a result.
Yes, it's hard doing everything, but it's so much better to have no partner than to have a shit one. I don't have to clean up his mess. I don't have to wash his clothes. I don't have to resent him not helping with the kids, because he's just not there. I didn't realise how much energy all of that built up resentment was taking until he was gone. And now when he does have the kids, I have some time to myself, which I never seemed to get when we were together.
I've realised I was never really happy with him, and that a lot of our relationship was me trying to convince myself that I was happy so I could try to make it work. In contrast, the happiness I feel now is completely different. It's mine, it's real, and it's got fuck all to do with any dickhead man. That's a lovely feeling.