When a preview would appear on TV, he or I would quickly change the channel. If a story popped up online I closed the window immediately. When friends started talking about the latest rumors I walked away...

It actualy never came to me not to watch preview. I usualy used trailer as a rating if it’s worth to watch. I felt sorry for your son when he tried to avoid his classroom friends talking about Star Wars. At first he must had felt he betrayed you and himself. Afterall it was both of you rule. Then, eventually you did the right think, he didn’t have to feel this guilt. You completely changed the rule to avoid spoilers.