Cant move on?

To cut a long story short, I was with her for 5 months 4 years ago, but I finished her for stupid reasons. She kept asking me back for around 2 months after that, but I said no everytime. I cut contact with her. 2 months ago, started talking, got back with her. She finished me after 1-2 days. I know this is pathetic, but I cant move on, I still like her :/. Shes basically been a **** since then. The day after that she told me she loved me (?) but wouldnt get back with me... two days later she was with somebody else. We had an argument the other day because she told one of my best mates to stop talking to me :S. 2/3 weeks ago i told her I still liked her, but she didnt like me back. Basically I just cant let go... advice?

try not to like her, just forget about her, if she talks to you, just tell her how you feel.
but just don't chase her.

Try and get over her don't talk to her.
You should let her know how you feel but if she doesn't feel the same try and find a new interest to try and distract yourself. It's not going to be easy it will take time but eventually you will get over her.

I think giving blunt advice saying to try not to like her wont do any help.

There's absolutely nothing fair about how she's pulling you along on a leash here, sortospeak. You have to come to the realization that there's plenty of fish in the sea. Distract yourself with other things. School work, a hobby, other friends. If you're busy doing other things your mind will eventually stop sliding towards thoughts of her.

In time you will learn to hate her.

Well you said you treated her like rubbish, therefore it seems like she took revenge. Get over it, should of treated her better when you had the chance.

It will just take time. You can't force yourself to feel better it will just happen. You will move on when you are good and ready but I wouldn't be in contact with her anymore as others have said.

Only time helps things heal. It's unfortunate, but it's the way it is. Lose contact with her and get her out of your life. You'll find someone so much better and worth your time. I really hope you feel better :(

Like someone else mentioned before me, you treated her with very little sensitivity before so maybe it was time for a bit of role-reversal?
There could be many reasons as to why shes behaving like this, one of them may of been to see if her feelings were still there for you, but she then realised they werent as strong as last time, or maybe even her trust isn't there incase she was left hurt again.
Either way her head and heart doesn't seem to be in it, she may still say she has feelings for you but what you've got to think about that even if she is still saying she loves you, it's obviously not enough to want to have you.
It hurts now but you've just got to try and get on with things and hopefully one day another girl will eventually take her place :)

In my opinion most girls are just ******, until you find the person that you're destined to be with they'll always talk about you behind your back, dump you after a day or just generally be an arse. Just try to forget about her :)