i cannot get 100% what you mean but you're saying it's need to be romantic from the two sides right ?
Well i cannot say sasuke's side is really not romantic since we don't see much from sasuke's side
That complete lack of "from Sasuke's side" is exactly why it can't be called mutually romantic. You're talking as if, out of nowhere, Sasuke is suddenly going to be hugging and kissing Sakura all over while ignoring all his prior actions and words.
There is a bit of "tell" with forcing Sasuke and Sakura having to literally call each other "husband" and "wife", which you seem to be taking as total gospel proof, but a complete lack of "show", which is where a lot of things are truly made or broken, and why much of the fandom believe that, regardless of Sasuke and Sakura being truly married or not, the relationship is not a mutually romantic or loving one. Up to now, throughout the entire Naruto manga, Sasuke has "said" a lot of things to Sakura (mostly negative things), but he has never "shown" anything resembling romantic feelings towards Sakura. It was almost always "shown" as annoyance, anger, hatred, or at best, neutrality. The reason why "we don't see much from Sasuke's side" is because there has never been anything there to begin with.
Just like with Naruto and Hinata, all the romance has come from the female's, with absolutely nothing (believable) from the males.