Stopping value item change on a select single

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We have a select single that has a value item change event on it.  If the user has made changes on the page, we ask them whether or not they want to change the select single value in the value item change event.  If the user wants to revert the select single change we are resetting the value item back to what it was before they changed it.  However, this is running the value item change event again.

We were looking to see if there was a before value item change event but don't see one.  Otherwise, we are trying to figure out how to prevent the value item change from running that second time when reverting the value back.  We have tried putting a variable on the Prevent Default property of the value item change event and setting it to true before we change the value item, but that isn't working.