People today, especially Americans, have been shown empirically to treat people and relationships as more disposable. Frequent moving around means a lack of stable friend groups. And because of globalization, even our stuff is considered more replaceable, and it is carrying over to friendships and romantic relationships.
While this mindset may prevent the sadness that comes from losing someone who has been very important for a long time, the tradeoff is a life that is less-enriched.
Americans vastly overemphasize happiness, even though for most of human social history, experiencing the range of emotions was considered the healthiest and most noble. Is it time we bring that back? What are we losing when we gain happiness? A surface contentment enabled by a lack of attachment is hardly an admirable goal.