I have talked to him. He acknowledges he does it but doesn’t know why. I’ve explained how stressful it is for me, and he says he understands. I’m bitter because it annoys the fuck out of me, not because he’s trying to “share” with me.
How about asking him to come to you instead each time? Or try to find some other way to help him break the habit. Don’t let yourself get too worked up about it.
My partner did this, I just started responding with “What is it??” every time without moving. He was doing it because he hates shouting across the house, but when I responded that way he’d come to me to show me whatever he’d found/was doing/needed help with/sometimes kitten videos.