Honestly, I have one frenemy. At first, I couldn't believe it. I said, Oh my! What did I do wrong? Why does she try to put me down? You know, I considered her as a best-friend and trusted her half of my life until I had enough of her love and hate. I mean, one day for example, she'll give me positive compliments while enjoying in a party together. The next day, she'll tell me hurtful remarks about my fashion ensemble and insult me with a nickname or something. So hello! Do you think I don't recognize you and the things you are doing to me?
Frenemies have different motives and they come in different forms. Some of them are plain unkind and self-centered individuals, others are just jealous rivals. It's up to you if you'll allow them to destroy you, though. Like I said, they can be very discouraging. You don't have to confront them about what they do to you. I know, they won't admit that easy. If they start to annoy you, the best thing to do is to avoid them.
Personally, I will never allow frenemies to ruin my life. In my 30 years of existence, I had enough share of bullying and all sorts of pain. Sometimes, I just laugh at them and even feel pity for them. Yes, at one time, they struck me and made me shut myself in a room and cry. But I swear, most of the time, they made me stronger and braver. One should fight back and protect herself, right?