Entrepreneurs may be rockstars but their partners are saints
medium.com
medium.com
Sorry, but you're as much to blame about this as your partner, if not more.
On this side of the pond, it's not uncommon at all to meet enterpreneurs (and employees, for that matter) who have an actual life. There's no incompatibility between the two.
Just make the limits dead clear:
1. At home on time to help make dinner every day; no work in the evening for as long as you're awake and around.
2. No work on WEs.
3. Periodically take a WE trip off to whereever.
4. Take a week or two off a few times per year.
If he refuses, or if exceptions turn into the rule, just leave him and move on. Life's too short to spend time with a partner whose priorities aren't aligned with yours.