Hehehe...tell you something lor. Some gals like to compare with
their ex and see who will get another bf/gf first lor. Something
like a friendly competition like that, see who will get happiness
first or so...
Another thing is often they also want to compare their ex with the
new one...see which one better lor. If they get someone better than
you, then they won't regret their decision to breakup with you in
the first place. If they don't, then you will see them complaining
their relationship troubles...blah blah blah...to you on the phone
until late at night. Maybe some of them might go back to their ex
later. Get it? 
So in short, this is a sick world we are living in with all these
sickos hanging around us...twisting with our feelings and mind. You
love...you break...you regret...you patch up....you find someone
better....you never go back to your ex again.
Maintain 'friendship' with your ex if that's what she wants....but
make sure you live a better life than her lor. Anyway, quite
unlikely for you to accept her again unless you like to use
somebody's else condoms. 
