How do you handle finding out one of your best friends is having a party and didn't invite you?

I know this sounds childish, but we are all 50+! I have known this woman and considered her a best friend for 20 years.
How do you handle finding out one of your best friends is having a party and didn't invite you?
get on the phone %26amp; ask "why didn't you invite me?"
Reply:you have to confront her. act like it doesn't bother you but meet her and bring it up in casual conversation. be all nice about it, not angry, and she won't know how to act. after the initial confrontation, you can tell her how much it hurt you to not be invited because you consider her a friend and thought she did the same, and you can figure out where you stand.
Reply:maybe it was going to be a surprise party for you! but don't sweat it because she would have said something years ago if she had something against you!
Reply:Well, first of all, I would now know that we're not as close as I thought. 2ndly, I would try to figure out why I may have not been included in this particular party. Could it be that she's having a party of a certain group that you're not a part of and would feel weird trying to fit in and associate with that group? Try to put a positive spin on it. You don't have to be invited to every single party she has, you know? Some people deserve a life separate of their "other life" sometimes, ya know? Just don't take it personally. If you're friends, you should try to understand!
Reply:ask her what she's doing on the day of her party. If she lies about it maybe you should make other plans or tell her u know about it but dont get mad... she couldve just forgotten you tho. dont make an assumption to quick tho.