It is implied in Ch 1 that he became aggressive
only after quite a while of no to very little physical intimacy and she rejected him aggressively as is her right.
I disagree with a lot of the rest of your comment. Men rank physical intimacy very highly. Women rate emotional intimacy very highly. (This
Marriage.com article basically says the same thing.)
In this relationship she's getting her primary need fulfilled while in their home (she'll hold hands in public at least) but he is getting nothing more than the goodbye kiss and she
looks at him with what appears to be disgust when he asked to cuddle. She even
doges when he tried to put his arm around her at end of the movie and
rips her hand away when he tries to touch it affectionately. All of this is making him
question his worth as a man and is breaking him as we see on the same page where she forcefully rejected him.
A wife who withholds sex from her husband with no apparent reason is not meeting his needs. A husband who withholds love and affection from his wife with no apparent reason is not meeting her needs. No, there is no "wifely duty" and a WIFE IS NOT OBLIGATED to have sex with her husband. A husband is not obligated to stay married either.
"Unjustified and ongoing refusal to have sex despite repeated requests" can be considered
Constructive Abandonment (along with physical or mental abuse, lock-outs, and kick-outs to give the other three bullets there) and can be considered grounds for an at-fault divorce. Other references:
survivedivorce.com,
legaldictionary.net (which adds Infidelity and Refusing to Provide Financial Support).
A marriage where one of the parties is not having their needs met is a Failing Marriage.
EDIT: One could say in general women put "too much focus" on the idea that remembering anniversaries and birthdays is necessary in their relationship to the point of making the husband sleep on the couch. (This has not happened to me.)