We say it around here alot, but the opposite of
love is not
hate.... it's
indifference. And "indifference" isn't just going to fall right into your lap, Bklk. You've got to nurture it along a little bit.
You're getting a divorce. Wishing it weren't so just keeps you stagnating. Accepting your divorce, looking forward to your new life... these are the things that are going to make a positive difference in your outlook.
I totally 'get' what you're saying about the family dynamic and the loss you're feeling on that score. But when it comes to your wife... what are you losing but an excess 120 pounds or so of pain?
It's been a long time since this woman was a true partner to you. It's been a long time since she had your best interest at heart. You've been on your own in emotional terms all this time. So, why not make it official and clear out the space inside you've designated for her? Put her out of your heart. Make room, so you can let something better fill it, and thus fulfill YOU. You know, just living a good life and getting some joy from your day will start filling in this empty space.
As far as the children go, have some faith in your own ability to parent these children at 100% capacity when they're with you. You don't need your STBX to be a good parent. And if you're operating at 100%, that's all your kids really need.
I know from your posts that your daughter is having a rough time. She's a little older and she can see that her family is changing. That doesn't mean that YOU have to change though. The hardest part for kids is seeing their parents unhappy and sad. It makes a kid anxious when there are unseen forces at work that even their parents can't seem to control.
So, even if you have to "fake it 'til you make it"... you can give her a bit of a gift here in acting like you're okay. Mind you, I'm not saying that you should lie to her. It's okay if cerebrally she knows you're sad. It just shouldn't be visceral.
You might want to see if you can rearrange your schedule for more one on one time with her. It's hard to do activities with a 10-year old and still keep up with a 3-year old. But if possible, now is a good time to take up some new hobby that's just for the two of you. Skating, horseback riding, hiking, even building a birdhouse or taking a cooking class... anything which is of common interest to both of you where you can enjoy each other's company is going to go a long way toward making her feel more secure.
I would probably avoid letting her see you date until she's ALOT better. But there's no reason why you shouldn't start seeing other people at times when your kids are with their mother. I'm not suggesting that you get into another "relationship", but having a companion for dinner or coffee is going to open your eyes, I think, to the possibilities in life and allow you to move on a bit as an adult.
Indifference to your ex is a goal that requires proactive effort. You can't arrive there if you're
feeding your sadness and giving into it. For your own sake and that of your children... you need to be HAPPY. You can't do that when you're still caught up in feelings of unrequited love for your STBX. There's a fine line between love and hate, passion and bitterness... but it's indifference which is the flipside of the coin. Indifference will put you on the path to serenity.