Hi Apowell,
we are social creatures and we all need friends. Heres what you need to ask yourself:
Are you still seeing her because you are sexually (or romantically) attracted to her?
No: then it's OK, be friends and enjoy each other's company
Yes (its yes isn't it

): thats not very fair to her AND yourself. Punch out because
A: its a fake friendship that way
B: its a waste of energy: focus your energy on better prospects (HB's who didn't IOD and or LJBF'd you.)
C: your chances with her will not improve (they COULD improve if she sees you have succes with girls she considers of her own calibre or higher.)
Good luck!
greetz
Bucc