Depends on too many things.
For all I know the person in this hypothetical is keeping themselves from admitting feelings and just can't make adult decisions.

Can they not commit because of excessive fear? Not enough expected emotions? Too many other emotions or input from other sources? Just not understanding their own emotions?

Other than that the best description would be "get away from them and find someone that isn't going to be playing these non committal 'i like you, just not that much, could be more someday maybe, but maybe not...I don't know...' games."


Childish.
Make a decision.
Try for more and be honest about how you are feeling communicate about it, sit around and wait for some kind of magic love monster to bite you, or move on and find someone who will make you feel how you want to feel.