"The new infidelity is between people who unwittingly form deep, passionate connections before realizing that they've crossed the line from platonic friendship into romantic love. Infidelity is any emotional or sexual intimacy that violates trust."
Source: Shirley Glass
author of "Not Just Friends: Protect Your Relationship from Infidelity and Heal the Trauma of Betrayal"
"It’s easy to deny the seriousness of an emotional affair — but it can be extremely threatening to a marriage."
Source: Dr. Gail on MSNBC
"If there is ongoing interaction with someone with whom you have been very honest in sharing your deepest thoughts and feelings, this can generate a feeling of closeness that stimulates even more sharing—and more closeness, and on and on. Eventually, this relationship can become extremely close and an emotional attachment develops, causing serious damage to the marriage—whether or not it ever becomes "sexual."