Researchers from Cornell University surveyed men and women to see what would make them most jealous when it came to their boyfriend or girlfriend . . . and an ex.
--Basically, people were asked to rank interactions between their partner and an ex based on how jealous they would get. Results were the same for men and women. Here are the top four responses.
#1.) Going out for a meal: The researchers said that there's just something special about sharing food . . . so the dating service "It's Just Lunch" knew EXACTLY what they were doing when they had people go out to eat together.
#2.) Going out for coffee: It's not as troubling as eating together, but it's still a problem.