Thanks for all your replies!

I will probably tell him similar to the way I explained it here.

Since I don't even know the information, I don't think I'm trying to be closer to him. I am somebody who is always very aware of how much personal information I share with people and where. Therefore, I also think a lot about what other people do and am often surprised about how little thought they pay to these things. While I agree it's not my job to tell him and I have the choice to just ignore it, I also think it's polite to inform people about things they can easily change and in that way protect themselves a tiny bit.

And thanks for the suggestion of going more often. I have done so in the past, but currently, I'm doing rather well and don't feel there's any need for me to go more than once a week. It might seem like I'm giving a lot of thought to things and think about something like his car a lot, but I am not ruminating at all about it, it was just a realization I had while thinking about my past and connecting it to more present things.