Thank you for your vulnerability in sharing.
I've always thought that someone who has a foot in both worlds.... doesn't care enough about either of the women.
Also, leaving your wife doesn't mean you'd be leaving your children. It simply means that you and your former wife reside elsewhere (freeing up your time with the children to really be present for them and develop deeper bonds). Don't you think your kids deserve to have a loving relationship with respect for them to model their own future relationships on? Straddling the two worlds robs them of this.