She said I’d be a great father but a bad boyfriend—what does that mean?

This girl who said that, we had a pretty beautiful date.
We went to the park together, and sat in the good sun.
I played with white flowers, and put them in her hair... we also went and got chocolates and treats.

A bit of flirting, but no kiss etc.,
Cause she moves back when my face is closed to hers.
And then after some cute little caring part she said I will be a good father but not a boyfriend.
It cut me too deep.
I actually like her but getting that from her broke me.
Now I feel hopeless, I have been to get a date from a long time,
But never got one. This date wasn't a date tbh. We are flatmates and I had feelings for her, but to get far from her I started going to bar but never got any dates, no apps nothing.
So at the end I started seeing her as a flatmate as she is...
And yesterday was just goofing with her.
But her comment still hurts.
I know I don't have any experience.
I know I am not good looking. But now this is attacking my own confidence and my own way of looking at myself
She said I’d be a great father but a bad boyfriend—what does that mean?
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