At some point in the past I considered leaving my job for a different job at a non-competing company. The interview went well, but I decided not to take the job. My boss doesn't know I considered leaving.
Now I've been promoted to a position where I may need to manage my company's interactions with the company I interviewed with. I'm concerned my boss may not take well to the information that I considered leaving. But if we interact with that company I can't guarantee he won't find out. What is the proper way of handling this situation?