No - rudeness and childish behaviour is just that childish. If your breaking up and don't like it you are going to have to find a mature way to deal with it. No one likes having an "ex" but it will happen as love is trial and error however, there is no need to get carried away. Although upset not all individuals are compatible, we learn from this situation and move on.
You can, ignore, tell off, or indulge him the choice is yours. No one can answer why your ex would come back except, your ex.
you should try telling them how you feel or go over to your ex boyfriend and ask him if he likes your best friend THEN you might want to tell them how you feel depending on the answer.
* It is you that is in the wrong place. He's your ex and therefore you no longer have a relationship with him. You are in no position to tell her to back off. It is you that should back off and leave well enough alone. Most people that breakup move in different directions so there is no real reason you should have anything more to do with your ex. If you all belong to the same group of friends then stick with your girlfriends or bring a date with you. Leave your ex and his girlfriend alone.
Yes, you should.
no you should not
if you feel like you have done a mistake. And if you have a chance of getting your ex back . Than only..
if you are still good friends. Than you can tell your ex.
tell him or her that the other person is much cuter
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.
Answer:yes you should tell her! She deserves to know. However you shouldn't be the one to tell her, it would only come off as evil because you slept with him and you happen to be the ex. But if you can't have anyone else tell her then be the bigger person and let her know what he is doing.
Tell your ex. if he doesnt care he needs help...but also if its bad then you should tell someone