Friend experts explain why three-person friendships are hard to maintain. They also offer tips on how to successfully ...

In a throuple, all three are in relationship with each other, and often not with anyone else." Never miss a story — sign up for PEOPLE's free daily newsletter to stay up-to-date on the best of ...

One helpful way to understand people-pleasing behavior is with the help of Self-Determination Theory (SDT). The theory says ...