You're overthinking the FB stuff way too much. People like and share things on it all the time and don't even give it a second thought. Maybe he did feel that way when he shared it, maybe he just liked what it said and it meant nothing to him. I don't go back and delete things I've shared because its just not on my mind later. I obsessed over things like that also before I removed W from FB and I realized she just clicked and shared chit all the time. Yes, many things were how she left but not all. Trying to figure it out only makes you go crazy.

Choice is to either obsess over everything he likes and shares and make yourself insane or just let it go.

When you unfriend someone tags are removed for everything I think, even pictures.

Accept what is, let go of what was, and have faith in what will be