Lyubomirsky and his coauthor, relationship scientist Harry Rees, surveyed people to find out how much love they felt in their major relationships. 70% of respondents said there was at least one relationship in which they did not feel loved enough, or did not feel loved often enough. Of those in romantic partnerships, 40% said they wish they felt more loved by their partner. And Lyubomirsky believes these numbers are an underestimate.
