Regardless of whether the text shows him to be wrong, it seems OOC for him to hold the opinion at all. For one, that's merely one facet of a whole host of really gross gender biases that comprised ancient Greek views on women, none of the rest of which we ever see from him (and rightly so, the man's supposed to be a likable hero). It's just bizarre to try to reconcile him respecting the agency and personhood of every other woman he's ever met with him thinking he owns his wife. For another, he's just never been a particularly proud or possessive or jealous guy. He was sad when Namora rejected him, not angry or insulting of her virtue, and he considered it her decision rather than fighting Namor for her. In fact it was he who told off Namor to the effect that Namora has the right to sleep with who she pleases.