A love triangle (also called a romantic love triangle or a romance triangle or an eternal triangle) is usually a romantic relationship involving three people. While it can refer to two people independently romantically linked with a third, it usually implies that each of the three people has some kind of relationship to the other two. The relationships can be friendships, romantic, or familial.
The 1994 book Beliefs, Reasoning, and Decision Making states, "Although the romantic love triangle is formally identical to the friendship triad, as many have noted their actual implications are quite different....Romantic love is typically viewed as an exclusive relationship, whereas friendship is not." Statistics suggest that, in Western society, "willingly or not, most adults have been involved in a love triangle".
Two main forms of love triangle have been distinguished: "there is the rivalrous triangle, where the lover is competing with a rival for the love of the beloved, and the split-object triangle, where a lover has split their attention between two love objects".