Most Helpful Guy
I don't think this sounds like a stable relationship.
And the relationship between you and your kids is irrelevant to your relationship with their father.
If you leave him, the kids will hurt initially, but if you explain the situation to them, it'll be OK in time
Most Helpful Girl
If you didn't have children with him would you stay? Is he displaying the morals and ethics that you want your children to absorb? If he doesn't want to be in the marriage, that's fine - people fall out of love and marriages just don't work out sometimes.
But to deliberately disrespect you in front of his family and your children, then continue to do so by having a child and allowing this other woman to degrade you is wrong. Not a chance would I stay for my children to witness that. I'd much rather be on my own than have them around that kind of behaviour