It's abuse. However many excuses you make. If he is under stress, it's up to him to own up and deal with it.
Ask him to talk about what he would like to alter in order to lessen his stress. Ask him if there is something you can help with or whether it is up to personnel at work. A Solicitor should be helping with the issues surrounding his brother and late father's property.
Mine read over my shoulder whilst I was typing - sending a message that wasn't owt to do with him. I sent him off to do something in the kitchen or elsewhere. Neither would he be opening my personal snail mail that lands on the doormat, that would instigate instant divorce. Mine. Years ago I had pen friends and he was sternly told that I would share if I thought he would be interested in the contents
It's your mobile 'phone. Even if he pays for top-up, it shouldn't be an issue. I don't believe in gadgets at the table or being taken into cafes etc., however!
Time for the discussion ........ as suggested, do not go in combative.