Best Friend Fued.

Kylie • Pregnant with a baby girl after 8 years TTC. 💕
Ok ladies so, I either need a little reassurance that my feelings are legit or to be told to sit the fuck down, that I'm overreacting. 
So, I am getting married July 2nd. My best friend is getting married August 6th. We've been best friends for 7 years now. She's having a big extravagant wedding, while I'm having basically no one at my wedding. (Getting married in a park with a big country party after).
So, I planned my wedding the same day as another friend's bachelorette party. I was well aware but, I wasn't going to change my wedding plans for a party. 
Things between her and I have been off for a few months but, I'm not a fighter or one for confrontation. I'm definitely a people pleaser so, I kept my mouth shut. Any time I spoke of my wedding, she changed the subject basically. So, Friday, a day before her bridal shower, I confront her.  Why have you not asked if you can help with my wedding party? Why have you not asked if I needed anything? Why have you basically been acting like my wedding isn't happening? Do you feel like I'm stealing your thunder? 
Summed up in a few words, she told me that she doesn't support us as a couple and she thinks he is going to walk out on my right before our wedding day and the wedding won't happen. EXCUSE ME!?   Also, she states that she probably wouldn't make it to my WEDDING because of the bachelorette PARTY. I never asked her to skip the party. I voiced that she should go to dinner with them and the casino a little bit but make sure you're at my party for awhile. After all, we are suppose to be "best friends." 
Sooo, I told her if she couldn't support me then I couldn't support her and I went ahead and removed myself from her wedding. 
It was such a slap in the face coming from her. An acquaintance or a fellow peer claiming he/she thinks my wedding wouldn't happen wouldn't phase me but, from my best friend, it hit me like a brick in the stomach. I find it so selfish that she can't be there to support ME even if she doesn't support US.   Mind you, she's never voiced this.. We've been together 6 years and every time I've spoken of marriage or kids with him, she's always played the excited "best friend", "aunt" role. 
So, tell me ladies, do I have every right to be mad/sad/upset/frustrated or was I out of line by removing myself from her wedding? 
** She claims he is going to walk out on me right before the wedding because when he turned 18, in highschool still, he was going into the Army. He and his long-time girlfriend planned on getting married before he left for basic.  He called it off because he realized he was going to get married for the wrong reasons.  He was 18. He's nearly 26. That was 8 years ago..  There was never any ring, any date, any plans. But AGAIN, 8 years ago. She's comparing our situation to this one, she claims.  As far as I'm concerned, an 18 year old boy to a 26 year old, successful, level-headed man is a HUGE difference.  What a difference 8 years can make for a man.