Triangulation (psychology)
Triangulation is a term in psychology most closely associated with the work of Murray Bowen known as family therapy. Bowen considered a two-person emotional system to be unstable. He also observed that two people seem emotionally closer when excluding a third party. Bowen therefore theorized that under stress, couples gravitate towards third parties to create "triangles", with two of the members always being closest - although which two are "in", and which member is "out", may be constantly shifting.