So you are now different people with the responsibility of parenthood. It changes people.
So can you start there? The way he smiles when he sees his kids, the relentless work slog he does because he wants to provide to make sure his kids have a safe bed and full tummies.
How you have built a home, made new lives and it's worth not throwing away. That some depression or at least low moods can be at least parked if you engage with the play and babble that is children.
Instead of a "date night" which the thought of used to make me cringe, could you agree to a breakfast together when the kids have gone to school once a week where you drink coffee and do something neutral together, like a crossword. So conversations might flow but nothing too pressured about your relationship, issues or parenting?
On Sunday could you do a team family bake? So some biscuits or cupcakes to have after dinner in front of the TV?
Basically I think it's about engaging together as a family before you make a final decision.
Have a bit of fun basically and then perhaps tackle your different parenting styles and think about meeting in the middle. He might have some good suggestions and you are stuck in a ruck of getting your heckles up everything he speaks. So say for example he hates doing bath time but you hate storytime, can you agree to take on most of what the other hates most and compromising on some and being in charge of some.
No family has a great time all the time.
Everyone goes through peaks and troughs.
It boils down to motivation to get through the troughs. It takes time. And calm open talking honestly.
If you want to both try of course.