wow - your "best friend" seems pretty charming.

I'd say you need to have a talk with her and see if she has any redeeming reasons for doing this - otherwise that friendship isn't headed anywhere good.

Another good thing talking to her will accomplish is seeing how all this worked out. If she threw herself at him to make you jealous, that doesn't really say anything about how he feels. Especially if you've been "patiently waiting" for years and he doesn't know how YOU feel.