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Man, she's a kid, a child. Your feelings aren't "wrong" but it would be wrong to pursue this relationship anymore. You obviously don't seem to know this. There are millions of women your age out there, there's no reason for you to be leading this child on.
I mean this nicely- Grow up, be a man, and date a woman. Let the kid go about her own life and don't lead her on. You mentioned you broke up with a 19 year old. Because this girl didn't like it? That means she thinks you're hers, and it shows that you have intent to be hers.
Seriously, let it go and move on. I can't believe this child's father has allowed this. Even though it may seem innocent, you're an adult and she's a child.
Musha ring dum a do dum a da