Lovely, you can't let the fear of 'unleashing' him on someone else make you stay.
It isn't about him, or some hypothetical future partner, it's about you, and your kids, and what is best for all of you.
I should NEVER have married my ExH, and it took me 16 years, marriage counselling, and 2 attempts to leave him.. leaving is hard, its fucking scary, even when you've had that 'glass/straw' moment, and it's not easy, its rocky, and difficult, and stressful.
I used to post about my ex on here, the shit he did, the knots he tied me in, people got sick of me moaning and stopped supporting me because i turned into one of those women who make excuses and never leave.
But eventually i DID leave, and that was 7 years ago, and honestly, the BEST thing i ever did. I'm happy, my kids are happier, confident, know they're safe and loved and while they do see him, and he is still a cunt at times, they know they're going to come home to a stable, loving, happy home at the end of the weekend.
I will always tell women who are at that break point, do it, please, take the leap, i know it looks like one hell of a drop, but you'll find your wings.
Take the leap. It's worth it.