I felt this way at first, but the more I have thought about it, the more I think it may be the opposite..
They had built very strong, defined roles within their relationship, and her dominant role was a strong, needy and demanding one from the start, who he was constantly asking to be meaner to him.
By continuing to behave in that way, she may have been striving to retain an element of normalcy for them.
We don't know how we will react to someone we love being ill, but we all know it would be more helpful and productive to behave as much as normal rather than crying and pitying all the time. I think it's clarified that is how she feels when she has to leave the room because she has started to cry and does not want him to see it.
It obviously comes across badly at times on camera, but perhaps it was hard for her to do too.
You can see his energy grows when he becomes angry as she pushes him, maybe that was one of the things she wanted - to keep that inner fire going. Even if it meant being the bad person.
The way he struggles to tell her how much he loves her, gasping near the end, makes me think he recognised that.
If her primary preoccupation was entirely the sexual side of the relationship and gaining of his possessions, I do not think for one moment she would have stuck so closely with him through those most excruciating moments.
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