Do we change our likes and our dislikes (that feed into our contentment) simply as a method of reassurance? A strategy our mind implements, a way to help us come to terms with the need to move or change job or sever familiar ties. Or, in fact, do these changes---these changes that so often come when we least expect it, that so often hurtle into our vision without a glimpse in our peripheries---act as realisations? Little nudges that we aren't, in fact, happy---and that change, that change, will be fresh, curing itchy feet and a fallen disappointment.
Just a thought.