Dude, do not try to read ANYTHING into her actions. NOTHING. If she called it quits you can be sure it was not a spur of the moment thing. And she hasn't come to the conclusion quickly, more likely than not, she's been brewing for years. So do not expect her to "come to her senses" any time soon. Do not focus on her. There is NOTHING you can do or say that will get her back to you. But here is stuff that you can to that would close the door forever. No not pursue her, do not beg, do not plead, do not reason with her. That ship has sailed.
You need to focus on yourself, you need to be the best dad you can be. You can do nothing for your W. Dress nicer, smell nicer, be groomed, get a life, go do stuff that you want to do, become a happy, confident, successful man, that only a fool would leave. And even then you might not get your W back.

You have to own your $hit. Recognize your faults, recognize your shortcomings, work on them and erase them. You also have to take a journey, you also have to better yourself, and lord knows there is plenty of room for improvement in all of us. A LOT! So keep your chin up, get a life and be the best damn self you can be.