To the OP – some very good advice ^^^. Have experienced a split and it is a world of blame/hassle/guilt/hurt etc and to some extent the ‘complications’ never go away. That said there is life after separation and providing you can keep it polite and/or remain a calm influence in your kids lives then it’s better than being miserable.
If your gut tells you to try again then DO listen to this. Definitely try Relate, if it doesn’t help you try again it might at least clear the air a bit and you’ll know you tried it.
You both need to try and see the reality that is post separation as it’s no bed of roses even if she thinks there might be someone waiting for her. Try to remember what you liked about each other, the good points and not just the bad. Get some time for yourselves as a couple, try some new experiences as that way you have a thing to discuss rather than ‘us’. Take your time to figure out how you feel and what you want. Don’t rush into anything.
Good luck, try your hardest and if separation is the way then continue to do your best. Trying to make things better is SOOO difficult but it is possible.
Practically, get some good legal advice and think very hard about the time you want your kids and what you can realistically do. If you can’t do half the time then you’ll not be the main carer and need to know the consequences of that now. If you can then don’t accept any less as the pattern of care you first have will be hard to change if the other parent doesn’t agree.
PND isn’t an excuse but it is a disabling condition that cn cause the sufferer to struggle in lots of ways. It also changes who they are and thus how you feel about them. Knowing it’s an issue is half the battle and you can both fight against it. So, worth a trip to the Doc’s to see what they say as that might help you both.
Good luck. Plenty make it work and plenty don’t. Either way you and your kids will be fine cos you’ll make it so.