After "breakup" she came back apologizing.why?

Our friendship grows really slowly and we have alot of misunderstoodings. Sometimes we argue and try to take a break from eachother,but she always comes back way faster that i tought, saying she really misses me and so.

The reason of our fights are that she usually becomes colder towards me,and that makes me unsure and i distance myself too. It usually ends with a argue.

So this month alot of things has happened. She went back to me after a big argument saying she really misses me,and she was flirting alot for next 2 weeks. Her best friend said she has feelings for me.

But then everything went downhill. She became distant.cold. and stopped using pet names.

And started talking about a guy friend she has(guy is younger than her and complete wuss)

So after a few painfull days I exploded and told her that im not going to be played. I told her whatever she tried to do with being suddenly cold towards me,not showing interest,and talking about how fun her guy friend is,she has done it. I said that its over between us. She even texted a laughing smiley saying bye. I was crushed. But i moved on.

Now..2 days later she texts me loong message trying to apologize. And alot of sorrys. She said she was and idiot and dumb for doing what she did.

I said that i forgive her,but i dont want anything else with her. She asked why,and i said that im scared she will hurt me. So she asked if i could put on hold that decision so she can fix her life,and after a month tell me what she feels.