You don't. You shouldn't be asking any advice from an ex that concerns anything to do with your current boyfriend let alone be talking to him in the first place. If you are going to break up with someone be upfront, staight forward, polite and honest. Then you should think about taking time for yourself and sorting out your feelings whilst giving yourself some distance from both ex's.
I don't think so. Your ex boyfriend would feel sad, you would be hurting his feelings. But you don't have to listen to my answer. Your choice.
No one here knows you or your ex boyfriend. You can ask him if you wish to know.
Questions you should ask is why does he want to harm your ex.
just tell your new boyfriend that you still have feelings for your ex and tell your ex that you have a new boyfriend if they really care about you they will understand
"be ma boyfriend"
No, you should not ask your boyfriend about his ex girlfriends anymore than he should ask you about your ex boyfriends because it was in the past and manners dominate discussing past relationships as they were private at the time. Just enjoy each other and looking back at the past stunts you from getting on with the future.
get a new boyfriend
Ask him.
ask him
ask him
If you are still interested in your Ex ask his friend that she will get the pick from her Ex not from his friend.
She probably did it to make the ex- boyfriend jealous.