Everyone has tough times, but it seems this friend is so absorbed in her own problems that it affects your mood. Plus, when you're having a hard time, this friend isn't the one to turn to - she's too wrapped up in her own depressing world. Most women enjoy a gossip session once in awhile, but if all your friend has to add to a conversation is the scuttlebutt among your circle, then she's a bona fide gossip. She certainly can't be trusted with your secrets, so it's best to keep this one at arm's length. When you're weeding out your friends and foes, it helps to consider quality over quantity. And if you have a toxic friend who you feel like you don't need to cut off, then simply restrict your activities together. Your tennis partner, for example, may be lots of fun on the court but not so great off of it. Limit your contact to just the activities you have in common - you don't have to feel obligated to hang out any more than you want to.