I'm sorry you are feeling this way. *HUGS* You can also decide you are NOT broken and your husband can't do that to you. You can leave WITH your kids and go to a shelter or with family or friends. I hope you do. *HUGS*
Im sorry you are going through this but you deserve to be happy too. Its hard either way, being in a marriage and not being happy or leaving and being a single mom. Ive been there but I do have to say in the long run I am happier being a single mom and I think my kids are better off. Even though they dont get to live with their dad they can still have a relationship with him. Good luck, hope things get better for you!