@pants like I feel like you're ignoring the text so that you can imagine the husband in a good light but leaving your home for a week after your wife attempts to initiate sex bc you've never actually told her that you aren't attracted to her anymore and have repeatedly indicated that, at some point in the indeterminate future, you'd like to do it, maybe, if youre in the mood, but if she presses the issue you won't be and thats her fault, isn't anywhere near like communicating effectively with your partner and setting an actual boundary or even indicating a need for space. Its straightforward avoidance, and its a despicable move to pull when your partner has indicated that their desire to communicate with you in order to fix your relationship.
Trying to portray the husband as someone in an impossible situation ignores the fact that hes a human being with agency. Its possible to be neglectful and avoidant to the point of cruelty, and thats where the husband has decided to make his bed. He's had two years to tell his wife that he isn't attracted to her! Two years to straightforwardly state that he no longer sees the need for them to have sex! That its not a need for him like it is for her! He refuses to do so bc acknowledging that they have incompatible needs would mean that his wife would have enough information to make an informed choice as to whether or not she wanted to stay in their relationship. Instead he strings her along by portraying his reluctance to sleep with her as a temporary state which will eventually be resolved once [work gets less busy/she stops pestering him/his ED is cured].
I guess you're right that the manga is unrealistic, realistically no one alive would've tried to make a marriage which had degenerated to this point work. They'd either seek divorce or reconcile themselves to a lifetime without intimacy, because its impossible to make someone who has just about outright stated that they aren't invested in you or your needs try to change themselves