The context behind this claim can be very situational for every individual, therefore I think this is a very broad statement to make. Numerous factors contribute to any person's happiness, aside from simply their relationship status. The article begins by one person sharing her individual experiences with being happier single. Although valid, this does not apply to everyone. The focus then shifts to straight women as a group, talking about how over the years they have realized that they don't need a partner to be happy. Some statistics are stated showing that there has been a decrease in people in a committed relationship over the years. However, there is no evidence that this is correlated to feelings of happiness associated with being single. Minimal data is provided through the article to back up this claim. Without substantial evidence, correlation to relationship status and overall happiness can only be assumed, therefore this claim is not well enough backed up, and for now can be assumed as false.