I feel that I should add my two cents - so here goes.
I grew up in a semi-abusive home. My parents fought every night. And sometimes us kids would fight with my father as well. All growing up I resented the fact that my mom wouldnt leave my dad. I asked her many times why she stayed with him, and she said that the Lord had told her that she should stay with him. After I moved out of my parents house my father was diagnosed as bi-polar and started taking medication which showed me the side of him that I hadnt met prior. Almost three years ago my mother was diagnosed with terminal cancer. Almost immediately I saw a huge change in my father. It wasnt from his meds, it was from the spirit touching his life. He has since shown me how someone can do a 180 and become who the Lord wants them to be. If my mother had gone through with the divorce all those years ago(and it was possible for about 10-15 years) I never would have grown close to my father. My siblings who have left the church, possibly wouldn't have started going back to church, and most importantly my parents wouldnt have each other to lean on during this struggle.
If my mother hadn't implored of the Lord and then heeded his council, my life would be completely different now. I dont know what is the right thing for you to do, yet I do know that whatever it is, the Lord will show you. I truly admire your willingness to change.