How many times have you asked yourself: Aren’t we too old for this? But the truth of the matter is those friendship squabbles you had as a teen don’t go away. Sometimes they are even worse as you get older! Andrea Lavinthal and Jessica Rozler, co-authors of the hot new must-have friendship manual Friend or Frenemy? A Guide To The Friends You Need And The Ones You Don't, offers a hilariously readable take on how to focus on your true friends and distance yourself from the negative Nancys who bring you down. 

What exactly is a 'Frenemy'? Andrea Lavinthal breaks it down:

She’s the Betty to your Veronica, the Tom to your Jerry, and the Heather #1 to your Heather #2. She invites you shopping when your credit card is maxed out, brings you cupcakes when you’re trying to cut back on calories, and brags about her fabulous, very important job while you’re barely staying afloat in the corporate shark tank. Basically, she takes sick pleasure in your pain. It doesn’t really matter what she is—underminer, user, clinger, backstabber, or simply clueless. The only thing that matters is what she isn’t: a real friend.

Here are Jessica and Andrea's top tips on how to decipher whether or not your friend has become a frenemy.

1. She Talks Smack Behind Your Back
A sure fire sign that one of your friends is actually a frenemy? She acts sweet as Splenda to your face but spews vinegar as soon as you turn your back. You know the kind: She’s the one who tells you that your new haircut looks fantastic, but then tells your hubby she doesn’t know why you cut off all your locks while running her hands through her long mane.

2. She (Gasp!) Tries To Steal Your Ex
Every woman knows that one of the most important friend commandments is 'Thou shall not covet thy best friend's ex. If you ignore this rule like Denise Richards did when she started dating her BFF Heather Locklear's ex-husband Richie Sambora, be prepared to pay the price in the form of an unbearably bad reality show.

3. She Makes Three A Crowd
Thanks to group dynamics, when three friends spend a lot of time together, drama can ensue. If someone in the group feels left out (which is often the case) it can cause the individual relationships to sour, especially if two of the people were friends first. That’s why the ladies in “Sex And The City” thought four was a fab number. 

4. She's Single (Or Married) White Female
There are times when imitation really is the sincerest form of flattery—like when your pal buys her daughter the same outfit you just got yours. But it can feel a little creepy when a friend goes from emulating your sense of style to mimicking your life. Signing the tikes up for the same camp, getting the same haircut, and using the same tutor gets to be a bit much.
 

Friend Or Frenemy? A Guide To The Friends You Need And The Ones You Don't is currently available for sale at Amazon.com. This guide will help you navigate the murky waters of modern day friendship. Andrea and Jessica examine friendships today while offering tips on making and breaking friendships, while reminding readers why BFFs are often the most important people in our lives.