The hurting and suffering are things that you can control.
Look at having the kids on Friday as not a problem, but an opportunity.
What is different now versus what would be if you are divorced? About the only things I can think of if you D now is you would be a lot poorer and you would be single so as to date.
You really need to reach a point where you can say to yourself that you did all you did to save your marriage. I dont think you are there yet.