Calendar cannot cancel editing an event

I'm using iCal with my company Exchange account. I was just editing a repeating series event. I was making changes to the body of the event. I found that I'd made a mistake in what I was doing and wanted to cancel the edit.

In Outlook or OWA you can simply cancel, or close the event without saving your changes to it.

But when I hit the cancel button on my Macbook Pro, the calendar event gives me a dialog window "Choose: Cancel, Update this event only, Update future events". You'd think "cancel" is what I'm after, but that button just brings you back to the editing screen where I'm stuck. I can't close the window without that dialog window showing up.

Then I saw the "revert" button. Maybe that will revert my appointment to its original state and let me cancel it with no changes being made. Nope. I hit revert and, while I think it reverted the text to my original text, when I try and close the message I am prompted to "Cancel, Update this event only, and Update future events".

Here's my issue: I don't want to spam people with calendar appointments every time I make a mistake. What's the trick here, Apple? How do you close a calendar appointment you're editing without saving it and being forced to blast all the invitees with needless data?

Thanks!