You think i should take her back?

hey, I am looking for advice/opinion on what i should do. If you could help me out, it be greatly appreciated, especially if you went through the trouble of reading this looooonnnnngggg message.

Okay i was dating this girl who i ended up really liking and vice versa, but she also was still in love with her ex, and nearing the end of our dating period it got worst and she told me 40 minutes before my grad dance/prom that she wanted us to work out but she just got back all her feelings for her ex after talking to his family again, and she didn't want me to be in the middle of her dealing with these emotions, and she broke up with me. But now, two weeks later she comes up to me and says that she is officially threw with her ex, she had to take two steps back to take one foward and she said she was sorry for what she did and asked if we could work things out.... Except, a girl who i had a crush on a long time ago while she was not single is single now, and we are starting to hang out and stuff like that, so i dont know if i should go back to the girl i still have feelings for and miss, when i am not 100% sure if she is over her ex, or don't go back and risk getting rejected with this new girl.... Please give me your opinion so i have more point of view to help me make a decision, and hopefully be able to go to sleep...Oh and thanks for taking the time to read this looooonnnngggg post...

she wanted to be sure that she was sure nothing was there between her and her ex. sometimes it takes getting rid of something good before you really know how good it was.

Thank you both for your posts...It was good information, but still not completely 100% sure, but thanks anyway

if you were sure it would not be love. love is so hard to deal with