It's important to be a good friend . . . even if your motivations are VERY questionable.
According to a new study out of Oklahoma State University, the main thing that drives us to be a good friend to someone is . . . jealousy that they might like their other friends more than us if we don't step it up.
The researchers found we're even more jealous of a person's other friends than their new significant other, quote, "Which means what makes us most jealous is the possibility that we might be replaced."
(Photo: Getty Images, Diana Haronis)