There’s a chance that your friend might kick you to the curb for going after her old flame.
Now your single/horny friends might see an opening when you break up.
That's a chance for your ex to heal his/her wound - The best way to heal a wound is to get a bandage.
Why do people have a rule or code as you will- that you should never date your friends ex-this goes for both guys and girls-if your friend and has broken up with their BF/GF- why is it a no go area not to date them?
Ever been on the receiving end of that unequivocal tenet of advice picked from a rather exhaustive section of the relationship Bible, called the ‘Ex code? Life is more grey and it is through the differential mixing of the black and white colors at the dual ends of the spectrum that varying hues of differing contrasts and intensity are produced to give life its essential experiential flavor.
If you do date her ex, she’s going to find out, and she will look upon the situation far more favorably if she hears it from you and not from some drunk girl at queer bingo.