I'm probably going to get slated but

[user1473509591]

I'm very unhappy in my relationship. It's not so much that there's anything wrong, it's just very unfulfilling, stressful, and I know he feels it too. We're definately not connecting, despite long chats, attempts to change, date nights, even trying to spice things up in the bedroom for the past year.

I'm the breadwinner. He's a sahd while running a business, but would make nowhere near enough money to support himself on his own.
I would just about be able to support myself if I move out.
I'm not sure how to say this without it looking absolutely awful, but wibu for me to move out? He would get help financially if he lived in our home with our children. I know hes more than capable of looking after the children competently. But I feel it's taboo and wrong for children to live without their mum. I know my eldest would be more devastated with me living than if their dad left, our youngest would be too young to notice.
And I know I'm being too soft on my dp, he's more than capable of finding a job if he was forced into it (back story, I was forced into being breadwinner, he decided to quit his job to start this business without discussing it with me first so I've struggled financially for a long time and his sahd status just happened naturally as he wouldn't budge on getting his job back and I obviously had to work more) but I still care for him and don't want to see him pushed onto friends sofas because I want to end it.
I don't know, I feel like I'm rambling here but I don't know what to do. This is my first real relationship, even with casual relationships I was never good at ending it.

Flying, absolutely- he is not a SAHD, it helps with childcare half the week, but if he had a 9-5 job, this could be covered by childcare on the days OP works as OP is doing the other days. The DH here chose to give up work to start a business which he works on half the week. He just happens to be at home for this. So as many posters have said, childcare is at least 50/50.

He isn't a SAHD if you work 3.5 days a week, and he looks after the children, then works when you are at home. It sounds like you both put in equal time to the children, equal time at work.
I'd have a long think about this if I were you, as he sounds amazingly helpful, especially if you take into account that he also does most of the housework.
If I were in your position, I would try and refocus on the fact that money is not everything, so what if he earns less than you? Him being able to have 3.5 days where he doesn't work and takes care of the house and kids actually enables you to be able to work without paying for childcare.

If you were a man posting that you were thinking of leaving your wife because she's a SAHM and only works part time but looks after children and house he would have his arse handed to him.

But it seems to me the financial things are what is stopping you leaving, OP, not the cause of the problems. You feel stressed and unfulfilled etc.

Personally I would suggest couples counselling if there are no abuse issues. Maybe it is about balance as you have long hours when you are working and maybe not much time for yourself when you are at home?

I am not sure in love works all the time in a marriage; but love - yes. If you still love him, then try and work it out. If not, then an amicable, but fair, separation could be worked out, by the sound of things. But as a single parent, i would suggest exhausting your other options before you get there.