I feel for you Eddie.
I went through a very long separation and it was very hard for all concerned. I have three daughters and I am assuming, possibly incorrectly, that you have children. All I have is some do's/don't s. All may sound obvious, but easier said than done.
1. Try not to obsess about what the Ex is up too, who with , and where she's going (Not easy, trust me)
2. Resist ALL temptation to criticize your ex in front of the kids, even if they complain to you about her. Trust me they will. Either to try and make you feel better, or for point scoring. I supported my wife constantly, even though I struggled with some of the decisions she made whilst we were separated.
3. Don't over compensate with the kids. Be normal. Don't spoil them now you are separated. The temptation is very real, but it won't help either of you.
4. try and be civil. You may want to rip her head off and sh*t down her neck, but learn to swallow crap. It will make life so much easier in the long run.
5. Try and play the long game. Think before you speak and try and see how your actions /comments could possibly be misinterpreted. It's tough and you will make mistakes, but all of the above will make this nightmare easier I promise.
Good luck fella