What does "affect component" mean in this article on well-being? Previous research lends support to the view that the negative affect component of well-being is strongly associated with neuroticism and that positive affect component has a similar association with extraversion. This research also supports the view that positive emotions—central components of well-being—are not merely the opposite of negative emotions, but are independent dimensions of mental health that can, and should be fostered.


Emphasis mine. Source.
As the CDC page you linked states,


  Well-being integrates mental health (mind) and physical health (body) resulting in more holistic approaches to disease prevention and health promotion.


Mental health and physical health are the 2 main components to well-being, and both these components have components within them.

Mental health will have positive affects and negative affects as 2 of its components.