When people say this I often wonder what each persons interpretation is what it means.
I certainly felt like you with exh. It wasnt ever going to be easy and that was realistic. So I tried and tried. Now I am divorced I can see so many times I should have just left.
I am with dp and I have to say, it's not easy, but it flows. If he has pissed me off we talk about it. Same if I have pissed him off. We are both happy to compromise, to make the other happy. Both do housework, childcare, shopping etc.
Exh did his fair share too. But everything was challenge, or someone was unhappy. He wouldnt compromise anything. I had to think about everything I said and did.
Life isnt perfect with dp, I am nor perfect either. We have had times it's been harder than normal. Moving in together, took adjusting. But it's good and I would say that overall it is easy. Both of our main focus is our happiness. Joint happiness. If I really cant compromise on something I can tell him why. Exh was abusive. Theres certain things I just cant do. But I can explain to dp why and he accepts it. He sometimes disagrees with me on a fundamental level to we work through it together with view of us both being happy.
Maybe your husband is wrong. Maybe he is actually right. But if only you are prepared to work at it, your marriage is definitely harder than it needs to be and it wont ever work.