Not sure what this means...?

[kit_kat96]

So yesterday after school I was just hanging out at home and I got an update from facebook on my iPod touch saying my ex-bestfriend who I have been bullied by and put down by for over a year and then ignored for 2 more years, has friend requested me, I have no idea what this could mean if she's like trying to mess with me (which she has done before) or if she sincerely feels bad about what she did (she really did quite a lot of terrible things) and wants to call it a truce and give up. It really annoys me because I have been working on for over a year just been able to get over and move on with my life with my new wonderful friends, and I just don't know how to respond or what to do.

SO my question is, what would you do or how would you respond? I need some help with this cause I don't want the bullying to start again, I'm and almost 16 year old girl and in grade 11 she is too, any help or opinions would be much appreciated