So the response prevention for this would be to “lean in” to the thoughts that are coming up and to practice moving on instead of ruminating. For example, you could lean in by saying to yourself “yeah, I might have been naive in the past” and then carry on with whatever you planned to do. If it’s extremely hard to move on, you can do an activity like reciting the alphabet backwards or reading a passage from a favorite book. These move-on activities shouldn’t be done with the intention to make the thoughts go away, but rather just to distract you from ruminating. As an exposure, you could write out a detailed script of what happened including what you fear MIGHT have happened. Practice agreeing with it and moving on from it without ruminating. Good luck!