Desensitisation training

Bruno has started to think he's the boss.
So I laid out his breakfast, called him in, then ran out the room to my seat. He gets so nervous that I'm going to leave him, that he will abandon eating to find me.
So of course he came bolting out the room.
He was in two minds, do I go eat or do I stay with mama.
So I let him go back to eat and repeated running off, zoom he came running and jumped up at me, several times, then blocking the doorway.
So I returned to the kitchen door way and we had a stand off.
He finally couldn't take it any longer so he returned to eat.
This time I ran into my bedroom and he chased me to see where I had gone, once he realised I was in bed he ran back to eat.

I'm sure his heart was probably racing, but I've been reading that it's key to desensitise your dog especially if they're high alert to the slightest movement.
I probably won't run next time but I will be leaving him more often again, as we've gotten into a little rut where I've not really wanted to do much so he's been with me allllllllll day!

As a consequence on walks, even at home he's on super high alert, he's becoming more possessive of me too. (jumping in to stop me greeting other dogs)

Consistency is key.