Is confused with how her "friends" are acting?

I'm really confused with how my so called "friends" are acting lately. On Wednesday our high school's freshman class made a freshman video. You had to be in groups of 9-10, and we won't watch it again til senior year. The night before, my friend Rachel texted me and asked if I was in their group. She named some people, and I said most likely not because I didn't like 2 of the people and didn't want to have a high school memory with them.The video day came and they invited the one guy,Jason's, friend into the group. I knew for sure I wasn't going to be in their group. So I went with my other friends. From then on, both Rachel and my other "best friend" Kaitlynn ignored me.No texts,nothing.Yesterday,on the last day of school they both completely ignored me.COMPLETELY. We were best friends all year, so I couldn't believe they didn't have the decency to say ANYTHING to me.While talking to my best friend Adam later that day, I admitted that earlier this week Kaitlynn was calling him gay.He flipped out on her via text, and then she texted me, trying to act as if everything was okay! She asked if she could possibly have the stuff she left in my locker before next week.Because she ignored me, I ignored the text. Just a few minutes ago, I discovered Rachel is going on vacation with Kaitlynn next week to Virginia! Kaitlynn told me I was going at least a month ago! I'm really starting to get fed up with these two, and I can't hold in my anger towards them anymore! I just don't know where to even begin with a text to them! It seems at the beginning of every summer, they act "mad" at me. And completely avoid going on vacations and stuff with me. I NEED help! I need some of you to help me construct a text to them! I KNOW, I'm POSITIVE I don't want to be their friends anymore! For years, I've put up with this crap, and I'm done! And no, I won't talk things out with them. I've put up with this for far too long, and I'm ending our so-called friendship now. So please,help! Thanks so much if you can! I just can't take it anymore!