When I wavered between putting up with my XABF's alcoholic antics or saying enough is enough, there was one thought that really swayed my decision and it is just like you said ...
"I really do not want them to be exposed to this situation."
I thought of my daughter, who really liked my XABF, yet didn't know the full extent of his verbal abusive and addiction. Our relationship was at the pivotal point where R would become part of my family, and the thought of him treating me poorly, possibly treating my family poorly was just intolerable. Yes, I thought about myself as well, but in total my family deserved better.
If you don't do it for yourself, think of your daughter and grandbabies.