I have another take on things. He has entered a professional phase of his life. I think it then likely that he is trying to clean-up his social media presence to reflect a more professional image. This is quite common and explains things like the untagging of photos in particular. It also explains his being distant when it comes to online communication. What he is trying is to re-brand his image. I would not take this personally as what he is doing is both relevant and meaningful.

Again, as mentioned, perhaps asking him might clear this all up.