How do I get my friend to stop rubbing it that he broke up with me in my face?

Sounds like you need to find a new friend, if your BFF really respected you then she wouldn't do things like that knowing that you are still affected by them. Your best bet is to tell her how you feel, if she doesn't listen and continues to be disrespectful and immature, then you need to find a new BFF who will respect how hurtful breakups can be and will help you get through them, not torment you.