I think it is pretty clear they know what they did. I don't think it will change anything but it is definitely a good idea to mention it to let this person know that you're not ok with it. After this, be careful around this person and what you share. If you feel it is happening again,. Feed him slightly incorrect information so if he tries this shit again, you can quietly correct them. Do this a few times and when they stop, keep on doing it.