Well... that's a really difficult decision. I think you'll ultimately have to figure out what's best for you and go with that.
For myself, I'd probably stay. Not because of love or no love, but just to be there for my kids until they are out on their own. I'd probably just put everything into the children and consider my spouse a co-parent.
I wouldn't try to love my spouse or try to get them to love me back, but I'd try to be friends with them. If you do decide to stay maybe that's where you need to go. Don't try to love her, just try to be a friend and coparent (still not easy! but I think it may be a good start).
On the other hand, I would never fault you for leaving in a situation such as you've decribed.
There is no arriving, ever. It is all a continual becoming.
