I want a serious relationship but she doesn't, yet she takes it seriously sometimes. What should I do?

Anonymous
Basically, I've met this girl 7 months ago and been with her for 6 months. Ever since I met her she seemed the kind of girl that likes to enjoy her life and her past, which i gradually found out in those 6 months, backs it up.
On the course of a month, we got to know each other a bit as we used to hang out a lot, and we ended up liking each other, during this month she learned the fact that I'm looking for a serious relationship, even if im 15 and the average mindset is to simply enjoy your life and take any chance you have, yet I just knew what I wanted.

Knowing this, she went ahead in taking the next step and asked me if id like to be in a relationship with her, I accepted. At first, everything seemed perfect, I couldn't have asked for more, but gradually I started feeling as I was putting more effort in it than her and she also tended to hang out another boys, which I wouldn't have really minded, if it wouldn't have taken a flirty path sometimes.

That's where problems started appearing, as she was doing that more and more until it didn't feel right, point in which i broke up with her, just to take her back after as she wanted to change herself, as she really wanted this relationship to work although her personality isn't fitted for one. I gave it another chance, things went well again for a while, until history repeated itself, not as bad, indeed, but it did.
I tried adressing the problem and letting her pick a solution, as this was bothering me, especially that the word would've always went around and end up at me, along with mocking and judgements to a level at which I would've happier without her.
After this, she wanted to change her personality once again, I told her that it might be better off to go on different ways, but she insisted. So I tried again, still hoping for things to sort themselves out.

In the end, she ended up at the conclusion that she can't change her personality but still wants me and I tried getting over her but I can't, I like her
I want a serious relationship but she doesn't, yet she takes it seriously sometimes. What should I do?
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