Don't see him. It means that he is always thinking the grass is better on the other side.
If she was real, she will not become an ex.
maybe he wants you back.
Simple Answer: You don't.
Kill the ex bf
wants to see and be with you again because he mises you
You live your life normally. What an ex boyfriend's new girlfriend wants should be of no consequence to you. None of the ex boyfriend's business is any of yours. If you see him around, be polite or friendly as you would to anyone else you know. You can make better choices than this loser.
Tell your boyfriend how you feel about it.
You should be confronting your ex and telling him you do not like his girlfriend asking your children about your new boyfriend and if it keeps up he will only be able to see his children at your home or without his ex girlfriend.
You do absolutely nothing about your ex boyfriend considering he has a new girlfriend. If he loved you he would break up with his girlfriend and since he has not then he wants to be with her and you need to accept that. Just because you have broken up with your boyfriend it doesn't mean you can just step back into your ex boyfriend's life.
she flitrts with you while they go out
either he wants something to remember her by or he still got feeling for her
get her a new boyfriend tell her that IF HE wants HER...HE WILL LOOK FOR HER.. If not he is not interested in connecting with her again