This isn't a question, its more of an informative statement about your personal life...
Answer: proberly because he got a new girlfriend, why should he stay and chat when he got a new love?
She probably did it to make the ex- boyfriend jealous.
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 should find a new bf
A girl should never fight with her ex-boyfriend's new girlfriend. The girl should move on and let her ex and his new partner do the same since fighting will not solve anything.
find a new boyfriend or girlfriend to stop you thinking about them ( your ex )
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.
If your ex boyfriend has not found a new girlfriend then take the risk and either text him or phone him and ask if he will meet you somewhere because you would like to see him.
No because she might have a boyfriend
Simple Answer: You don't.
To say: "Just to let you know, I dated this girl before you; but we are through now"
either he wants something to remember her by or he still got feeling for her