Jealousy over an opposite-sex friendship can be the result of projection, says Dr. Bonnie Jacobson, a New York City clinical psychologist and author of “Love Triangles: Seven Steps to Break the Secret Ties That Poison Love.” Some 83 percent of the people surveyed think that cross-gender friendships can and do exist, according to a 2001 Match.com poll of more than 1,500 members.
