I have been a divorced single mom for a little over a year now.
Think long & very hard about divorce, because you can't necessarily "go back".
Here is the nitty-gritty of divorce...
The first thing you're absolutely going to need is a support system, without it, well, you will falter more than you want to.
Second, you have got to work out a plan to explain everything to your kids. Your kids are your top priority. You have to think about how you're going to explain grown-up things in adult in kid-friendly language. Be prepared for questions and tears and confusion. You have to be in the right frame of mind to support your children.
Third, you need money. A divorce can average about $6,000 in my state & that is the basic, friendly divorce.
Fourth, you need to understand that you will be a single mom. You won't be staying at home, you won't see your kids as much, you will work full time and then come home and "work" your other job as a full time mom. There isn't a lot of time for you and the kids basically are with you all the time. It is damn near exhausting.
Our society gravitates towards divorce as being a "simple" solution, but it isn't. Sometimes, it is unavoidable, but when there is even the smallest glimmer that it can be avoided, then it should be.
If things are very terrible, maybe a time apart is an idea. Sometimes, we all just need to clear our heads & gain some perspective back.
Don't be afraid of the "hard" parts of life... and that includes the "hard" parts of marriage.
May you be blessed with strength & clarity.