I agree that the whole 'win her heart'', 'fighting' for her type language is cringy, (just my opinion).
It all sounds very intense on your part. What you may have experienced as something special, or something being there between the two of you, might be true for you. But not for her.
Obviously she didn't feel the same.
So you could either, cut your losses now. Let yourself feel dissapointed and sad for a bit, pick yourself up, move on, acknowledge that you feel sad, but don't get lost in it. After all, you survived without her all this time, and you will survive again.
If you really wanted to, you could as another poster suggested, leave it for a while. Then approach her again, see if she wanted to meet up again.
Be honest and say how you feel and what your hopes for. However! This will require you to be vulnerable AND you have to be prepared for the emotional consequences.
If she's still not interested, that's it.