Oh my word this could have been me last year.
Married 13 years, kids same age as yours.
Nothing in common, loved but not in love, also depression, loneliness, isolation, boredom, etc etc
Stressful couple of years so We planned to go on an extended holiday.
I took kids out of school , planned it all etc , Dh decided he couldn't go for as long as planned . So I went alone.
BEST move ever. Space, freedom, independence , happiness, TRUE happiness and a feeling of being alive again. He joined us for the last couple of weeks of travel and his moodiness spoilt it all and I realised I had done the hardest thing and that was to admit to myself things were beyond repair and I HAD to do something. I came home and decided to leave.
I rent a house nearby, we share the kids, he supports me and them and our relationship is better, tho we are separated and not going for divorce yet. I am happy , kids are (mostly) ok with is and I feel a different person.
If you want the space you must just do it, move out, do something but take control . Happiness is such a wonderfull healer