ask yourself this question: if a gal is truly interested in you,
do you think she will give u this reply? Just ask any girl friends
of yours for their opinion if they will play a waiting game to the
guy they really like.
the fact is: she is trying to reject u politely or maybe you two
can go out but will never be together because she has never ever
considered you before.
The best thing u can do right now is to get to know other gals
until she gives you the answer. there is no rule stating that u
can't get to know other potential gfs. Besides, u two were never
together in the first place.
Classic replies to look out for: ''I'll call you back later'',
"I'll let you know again'', ''give me more time'', and so on. You
know.