Question girls..what should I do?..help..?

Ok so my ex and i broke up. She pretty much left me in the dust when she went off to college and told me that she diddent think things were working. So i moved on. Anyway, now 6 months later she messeges me on messenger and texted me that she misses me and that she made a mistake. My question is, should I let her back in to my life after what she pulled? I feel like a damn toy. I told her I can be friends and nothing more, I said we had some good times but I didden't appreciate her leaving me there and not talking to me for 6 months. She dont want friends, she wants more. Anyway should i just not let her back in?