My friend and I have been friends for over a decade. We see each other typically every three weeks, and we have spent many an hour supporting each other through life's twists and turns. Holidays, weekends, family parties and the odd Christmas and Easter we have spent together. We have a great friendship, and she is very special to me.
Her birthday is just after Xmas, she is going to be 40, I asked her what is she doing to celebrate ages ago: a family holiday and a party next summer she confirmed. Since then she updated me to tell me that her old uni friends are hosting a dinner for her on her birthday day night - it is a Friday, all girls dinner organised by her friend I do know her, but not well at all. I am completely fine with this, as they are a very old group of friends and she is very close to them.
The issue is my sister seems really cross about it. She said I should be invited, that if we are such good friends, why wouldn't she invite me, that I am way too easy going and this friend only wants to see me on my own terms.
I don't feel my friend is being unreasonable. I am sure my friend will invite me to the larger party next year, but my sister is insistent that I should not have bought my friend such an expensive gift if I am not even invited to the dinner party. She says I am always like this, too nice and people take advantage. I don't know what to think. My sister has just let my house shaking her head, she usually has my back, and just texted me on the way home to say she loves me but I need to wake up and stop being so naive
Am I being naive as my sister says?
How you would feel?
Should I be upset?
I have said I will let my sister know what you all think. I have NC for this for obvious reasons.