<human>: Can you provide a brief rundown of the text in within 3 sentences?

I'll be straight to the point, my bestfriend [16 F] didn't respond to my texts because she was introducing a guy to her family, and to be fair I find that quite sweet. Except for the fact that she didn't answer for four days and a week earlier, she agreed to go to an amusement park with me. What grinds my gears is that she told me the day of we were going, that she was going with this new guy instead of me without giving me any sort of warning. I am still feeling betrayal and anger, I know she probably meant better, but I can't help but feel like shit.
<bot>: Bestfriend told me the day we had plans she was going on the same plans with new guy, feeling betrayed, is my feeling justified?