Lots of great advice. I just wanna add this. First of all I'm a father too. Been here at this exact point.
Kids are NOT a reason for a woman to prolong a relationship if she ain't feeling it.
To us men they might be. If a man would make a thread saying(never happens ) " I have kids ,house together ect but its ME who wants to leave" ,everyone would probably tell him it's irresponsible to leave her with the kids and just to chase women. Women are different.
At this point you have to apply three different strategies at once;
1. As
@AmsterdamAssassin said, try the rekindling game. Why wouldn't you? You have nothing to lose at this point. For all we know you MIGHT save as much as possible.
2. Meanhwile you still gotta plan your exit. Just in case...assume that most reactions unfortunately hold some truth to them.
We've all been there bro..nothing happens without a reason. Something must've triggered her to look differently at this relationship, BUT its a damned complex and tiring game trying to find out what. So you wanna view this situation AS SOBER as possible . At least THINK about an exit strategy, and imagine in detail what it looks like.
3. Keep working on yourself. At this point its not even a 50 50 situation anymore. When women say things like this she's entering the point of no return. Its even more painful when there are kids involved. Start your recovery phase now. You already started hitting the gym. Good. Now , as akward as it may be try to at least make some form of contact with other women. I don't say sleep with them, just ...run hame on them. Stay sharp ,or get sharp again.
4. I just came up with a forth reason. Assuming you're applying all of the above:
Be dead honest. Sit her down. Ask her what's going on. A heart to heart. Be ready for some perhaps painful moments. At this point imo you deserve to know the ins and outs of her motives or lack off. If she refuses to talk or anything like that, that's still an answer. Apply 2, the exit strategy. As
@parabellum said , tell her you are oke with going your own way, and you just want (LEGALLY!!!!!) signed papers that allow you to always have access to your kids. (
That's why I say PREPARE everything BEFORE you sit her down!! You should almost be able to leave the next day ,thats how well prepared you should be. You should already know what laws will benefit you or work against you. If you dont know call a lawyer TODAY!)
Inform asap every person/all people's you are so close to that you can stay over for some time, if necessary.
As I said it's a lot . But you can't sit back and play the waiting game anymore, there water on the deck already and if you dont act you'll drown. Don't reckon her to be "sensible " or " rational " . Its passed 50 /50 now and even if it was, you don't wanna play these maybe games with women. Never.