I was in a similar situation several years ago. I decided to stay - I felt we were doing the right thing bringing up the kids in a secure family home etc etc. Also, it wasn't necessarily his fault I'd fallen out of love with him; I did still quite like him...
Anyway. He then embarked on a long term affair with a 'family friend'. After 2 years of disquiet & gaslighting (he'd constantly tell me how unhappy I was making him by my 'coldness', whilst hand waving away my spidey senses about Ms Lovely Who Me & The Kids Really Like, She's Such A Good Mate, You're A Paranoid Bitch) - I eventually called his bluff & kicked him out.
He then behaved appallingly. I could write a book - god it was grim. He put a huge amount of effort into shafting me financially, tried to control various elements of my & the kids' lives, & still feels himself to be the hard done by victim.
It's hurt my dc enormously & years on the shockwaves are still rippling through them.
The dc & I have moved on, & things are good, but still.
I should have been honest that I didn't love him anymore & was just staying for the stability. He should've been honest that if he couldn't have me adoring him as he felt was his due, he'd feel entitled to look elsewhere.
We both hugely fucked up.
Talk to your H. If he won't talk, you have your answer...you're done & need to make practical arrangements to split amicably.
It's an almighty bomb just waiting to go off, otherwise, as soon as one of you finds a reason to leave - usually someone else. All that pent up unresolved misery has an excellent chance of exploding & raining shit on everyone.