We should not normalize people making rash decisions and chaining themselves to someone to fulfill cultural fantasies about romance. Don't marry someone you're not willing to walk to the grave with.
The reality is that in every relationship (whether marriage, business, friend, sibling, whatever) one person will have more leverage than the other.
That's not the problem. The problem is when the party with the leverage uses it! The phrase "happy wife, happy life" is problematic because it normalises the usage of this leverage.
(And if you think women have all the leverage in the average relationship, just wait till you get to over 45 and the kids are all old enough).
“It’s cheaper to keep her” is also a saying. So it looks like she still has the leverage.