I guess that depends on how much time has passed, and how you last left things.
because they can be friends again then be gf and bf
Stare at her. Tell her. Be smart
You have to communicate with your ex girlfriend to see if there is any chance for you both getting back into the relationship. If she does not want to get into a relationship with you again you have a right to see your own children and perhaps suggest you make plans with your ex as to when you can see your children. If she disagrees then you should seek legal advice to have partial custody of your children.
he wanted to be with me again
Only if you are sure that you will never talk to your ex girlfriend again.
ANSWER: Pardon me but if I were you I will be more concern on how my ex girlfriend will trust me again. Sex can wait, you need to get her trust towards you again or else you wondering if you can get her back in bed will be impossible.
please be my girlfriend again
Ask her out again.
Well, if you love your ex then you can either ask her out again or your screwed. That simple. Glad to be at your service!
You will only know it by asking her!
She already has a boyfriend whether he was her ex before or not and until she decides if she loves him; you or someone else or no one at all then it's hands off for you. You'll have to wait it out, but if you were smart you'd start getting back into the dating circuit again.
'Ex' means the relationship is over and since you have a new girlfriend you should be more respectful of her and move on from your Ex. You are heading for trouble if you add your ex girlfriend onto Facebook because sooner or later your girlfriend will find out. Put yourself in your girlfriend's place ... how would you like it if she had her ex on Facebook and kept it from you.