Answer
You don't. How would you like it if the shoe was on the other foot, and he was trying to figure out how he would ask your ex-girlfriend out. Not well I'd expect. Try getting another girl to go out with and don't ruin a good friendshp because of a woman.
The best thing you could do is ask him directly as he is the only one that can answer this.
Yes, but now since all your friends should be mutual they won't be alone.
They are good friends despite breaking up; the two are not mutually exclusive.
Ask her out on a date.
Quick answer...yes. Just put yourself in his shoes. If you and his exgirlfriend were best friends and she made advances on him, wouldn't you want to know?
Think about why you are not great best friends anymore and what you can do to become best friends again. you could ask her and some other friends out to the cinema or shopping, but ask some friends that will not make her go off with them and not talk to you. Hope this helps :)
you tell him and ask if your really best friends, because best friends should never ignore you
Maybe not now, but there will come a time after you have truly gotten over her that friendship will be possible if you want it.
If you r already friends with him then u might want to ask one of ur best friends to ask him what he thinks about u.
If you are friends then your cool, but if you hate her than try to avoid her. As long as you're ok with each other then just be polite: say hi and maybe ask how she is. If you're not on good terms just smile - try not to be rude.
Don't ask her when she is near her friends. Don't come and ask her out with your friends. In private is the best place. When no one else is around and you have her attention. You could ask her anywhere if you can ask her in private
The best way to get fans on your facebook page is to ask your friends to become fans and also asking them to ask their friends to become fans also asking their friends and so on.