A very delicate question that requires a lot of input from you.
May not be advisable here..
Just think through this before u decide.
What has kept you with him for the last ten years? Obviously it didnt bother you so much... or for some reason you bore it all
What is pushing you to take a decision now?
What are you exposing your children to?
What are your beliefs about marriage - will your decision be in line with it.?
Can another arrangement like giving yourselves space work?
Make sure you will never regret your decisions.
Think through before you decide/
Wishing you the very best and clear thinking