You probably shouldn't. it isn't really any of their business but if you want to tell them go ahead. When...well whenever you get a chance? They might not care, and if you've moved on then just forget the Ex.
no you should not
Yes, you should.
You don't, but if she is then that is her problem. It is your ex-girlfriend, you should have moved on.
if he was your ex you should be over him. If your not over him you should tell your friend or try to get him back.
You should tell him you should be friends. Then later on, it might lead up to a relationship.
play the field. chances are, that your ex has probably moved on, as you should too.
I think you should talk to your boyfriend and tell him to have a little chat with his ex.
'Ex' means the relationship is over and your ex has moved on and it would be wise of you to move forward in your life too.
if you feel like you have done a mistake. And if you have a chance of getting your ex back . Than only..
tell him or her that the other person is much cuter
You should tell him to get lost.
Well, one thing I've found to be amazing is you take them aside, and you tell them how you feel. You tell them the reason you broke up with them, and tell them that they should move on with their life, because you have moved on with yours.