Considering how she didn't even know how to set up her own pedal board and that I was the only one who knew how to set up the in ear monitor system, I'm not sure why you'd think I overstepped.
I did exactly what we agreed that I would do.
Keep in mind, they had only recorded in a studio. They had never played a show before under this band name and with these songs.
Don't worry, they made a fault, sure. From their perspective, you also may or may not have made the fault of crossing boundaries as the new guy. However, they did not let you know - so, they'd be to blame for being inable to communicate.
In the end, it may be that all had different expectations on each others behaviour; couldn't communicate and seek understanding for each other. Of course, you're to "blame" as well for not being able to forgive them, and solve the dilemma.
Fazit: Whether you reacted wrong or not - who can tell, if not yourself. I'd say all of you contributed to that outcome; be it intended or unintended. But chin up - you did nothing (intentionally) wrong. So, you don't have to blame yourself at all, IMHO. Still, it'd be
their right to blame you for not meeting their expectations, just as you might blame them from your point of view, for not having met their expectations. And all are to blame for not communicating each one's expectation.
Aside from that: Feel free to look forward, not backwards. From what I've read you're an awesome and caring band member who deserves awesome, caring band members. \m/
Much success, Happy Easter!