Yeah he couldn't have expressed his thought in a worse way but honestly, I kind of understand him?
If I were a celebrity I'd be terrified of dating anyone right now. The moment I decide to bail or that things don't work for me all that stands between me and the person I dated hitting TMZ with allegations of me being a perverted, a rapist, an abuser or whatnot is the moral fiber of said person.
Would you take the risk? As terrible as it sounds, I think Cavill is lamenting that the fact that we're now putting more attention to consent and actual parity between sexes has changed the rules of the game. He's confused, like all 35+ guys who grew up being told romanticism was one thing and "getting the girl" was a matter of being good enough instead of her being actually onboard with it. The bit that I'm not completely sure he's getting or missing is that it's possible that the fact that traditional romanticism "is dead" can be true but this can also be a good thing.
The bit about "no being no"... I agree that no means no. I absolutely embrace the idea as it's honestly liberating. But at least 3 times in my life I've been in scenes that seemed straight out of The Notebook where I was trying to understand a crying girl telling me "You don't love me enough, I pushed you away because I wanted you to chase me/fight for me/show you cared".
Imagine yourself in that situation, as a celebrity, in the age of me too. I mean, look at movies themselves. How many times one of the protagonists shutting up the other with a kiss is considered a romantic moment? Yet that behaviour can be as easily framed as forcing yourself or an unsolicited sexual act. And at this point the go to answer is "context matters!" but if context is all that stands between you and a career-ending lawsuit, in an environment were rightfully we're discussing how to defend people who gave consent and then changed their minds... I wouldn't take the risk.
In short, I think it's a mix of him being a celebrity and thus being somewhat terrified of traditional dating due to the current climate (it may be irrational, but not all relationships end well and a relationship not ending well for a celebrity can be a PR disaster) and having to let go with the concept of romanticism he grew up with.
It's ok, we'll survive, Henry.
So yeah, he should have kept his mouth shut and stuck to dating other, equally terrified celebrities, but I get where he comes from.