If you've done the honest looking, with time and probably with help, and the answer that keeps coming back is that this marriage needs to end, then this is for you, and there's no judgment anywhere in it. Not every marriage can or should be saved. A clear decision to part, made with open eyes rather than in the heat of a bad year, is its own kind of integrity, even when it arrives wrapped in grief.
This is allowed to be grief and clarity at once
Deciding to separate isn't the same as not caring, and the sadness that comes with a clear decision isn't a sign you've chosen wrong. You can know something is right and still mourn it. You're allowed to grieve a marriage you're choosing to end, and the grief doesn't mean you should reconsider. It means it mattered. Both things are true.
What matters now shifts
Up to now the question has been about the marriage. From here, gently, it changes, to the landing. Two things matter most on the other side of this decision. Your own healing, becoming a whole person again rather than half of a marriage that ended. And, if you have children, their steadiness, the work of making sure their world stays as solid as it can while its shape changes around them. Those two, your healing and their steadiness, are the real work now.
The thing that matters most for your children
There's good clinical reason to say this plainly, because it changes what you focus on. What shapes how children come through a separation is, more than almost anything else, the amount of conflict they're exposed to, not the separation itself. A calm, low-conflict separation tends to be far gentler on a child than the war it ended. So the most protective thing you can do now isn't to have separated perfectly. It's to keep the conflict away from them, and to keep their everyday world steady. There's separate writing on exactly how a clearer decision protects a child either way, and it's worth reading next.
You don't have to have it all figured out
You don't need a finished plan to have made the right decision. The practical scaffolding, how two homes work, how you'll co-parent, all of that gets built over time, and there's real help for it when you're ready, including a whole approach to keeping a child steady across two homes. There's also support for you, for the particular grief and reinvention of coming out of a marriage. You don't have to carry the landing alone, and you don't have to do all of it at once.
Choosing to part, clearly and with care, isn't a failure of love or of effort. Sometimes it's the most honest thing two people can do. The marriage may be ending. The work of doing it well, for yourself and for your children, is just beginning, and it's work you can be helped with.
This is supportive self-help, not medical, psychological, or legal advice, and no substitute for a qualified professional. If you or your child may be in danger, contact your local emergency services.