I'll try to keep this short.
DH and I have no children, we have both always worked full-time, but he has historically earned about double what I do, in a much more stressful job, with expected long hours of unpaid overtime. He paid a bigger share of bills etc in line with our salary differences. Because we both worked full-time we have taken equal responsibility for household tasks (though he is more fussy than me so chooses to clean a lot mire than I deem necessary, he also loves to cook).
Last year we moved to a more affordable area so that he could change career as he was getting burnout. This meant he could reduce his salary and we now both work full-time, earn roughly the same (40k ish each), take equal responsibilty for bills, and his stress is far better.
However (here is my aibu) - my job is really dull and I've seen something I think I'd like to try. But, the salary is a drop of about 14k (still full-time) - which would mean dh being the main earner again.
I've spoken to my sister and she thinks aibu because dh wouldn't be able to afford the "luxury" of dropping his salary for a job he liked more as we would be relying on him maintaining his earnings. She also thinks it is unfair of me to decide to "throwaway" our chance to save for a better retirement. But I think DH has had a chance to take a salary drop, so why shouldn't I?
We would have to forfeit foreign holidays and treats , but I'm happy to do so for a chance at doing something new. But aibu and am I (as my sister says) being selfish?