Should i give her another chance?

You're spot on - she hasn't changed. Why would you even consider taking her back? She wants you back now that you'd look good on her arm, but be sure not to gain even a couple of extra pounds, because you can bet you wouldn't see her again for dust. She thought she could do better than you? Truth is you can do better than her. She's shallow and superficial, and doesn't appreciate the person you are. Tell her where to go, and find a girl who loves you for you.