shandy first and foremost this is your life. What a bunch of strangers post on an Internet forum shouldn't allow you to make your decision on what to do. That strength can only come from you alone.
Yes, there are many people stuck in situations like this. It's heart breakingly sad. For everyone involved.
My parents did this. I did it for 2-3 years (the last 2-3 years of my own marriage). I can categorically tell you that had I not found out about my STBXH deep and twisted lies, we would still be together and I would be determined to push through head down. Because in my mind nothing 'bad enough' had happened that would justify breaking up a family. Certainly the 'I'm not happy enough' card carried no weight.
Because facing that decision is hard. I get it. If nothing big and tangible has happened (like an affair or DV) we both know that you will get people judging you for breaking it up.
Then there is the emotional impact - how will the children cope? Accompanied by the thought We may not get on but he's a good father.
Financial, how can I afford to be alone? How can I afford a divorce? How can I do all this without him?
The list is long.
The thing you get OP with posting on this board is that there is a lot of us who in the past have been in your shoes. For whatever reasons we are no longer living as that family unit (affairs, separation, spouse just up and leaving etc etc).
I won't speak for everyone here but I can say that I would categorically never have broken up my family. I absolutely thought that by putting my children's happiness first I was doing the right thing.
Now, I look back and recognise that I simply lacked the strength, self worth and proper EQ to stand up and say this isn't good enough. I was copying my parents, because their marriage had shown me this was good enough. Arguments? Fine. Separate beds? Fine. Rude/ stroppy behaviour, fine. Making no effort? Fine. Not Holding me and telling me I'm beautiful? Fine.
The net sum of this (only last 3-4 year especially) is I have built so many protective walls around me (I built them so DH lack of engagement didn't upset me), I am having to work really hard to take them down. I am going to have real intimacy issues moving forward if I don't.
It's been a hard 6 months or so. Emotionally I haven't absorbed the impact as my life is focussed on supporting my DC's. Working. And getting the hell out of this marriage with as much as is needed to protect my children's future.
However, despite all of that. I am happier. I look younger. My home has a lovely peaceful, loving, Atmosphere that it lacked before. My DC's are doing ok, in fact they have turned into less shouty and more openly affectionate children.
And that's why you get the advice you get when you post. I've been there. I know how you feel. However the trigger is pulled and I am coming through the other side intact and happier than I thought I could be. Incredibly grateful that I haven't inflicted my upbringing of witnessing a marriage with no love on my DC's.
So I certainly have written this mammoth post, not to judge. Not to tell you to leave. But to say it's ok to stay, it is your life. But also to give you hope and plant that seed. That one day if it ever does get too much (or a grenade does go off in your marriage) you'll be ok. As will your DC's.