<human>: Give me a shortened version of the text

We've been dating for almost a year, and in the beginning the only time I would see him get mad was at videogames. If he was really frustrated, he would hit the desk or something. Pretty normal, everybody does that sometimes. But in the past few months, probably because he's more comfortable with me, when he has really bad luck in a game, he's been throwing empty soda cans at the walls, hitting the desk REALLY hard, and even picked up my keyboard and slammed it down so hard that all the keys flew off (some of them are still missing). Still, this is your generic nerd rage. Not much to be worried about.

Today he got an order from amazon and it was defective. He almost ripped it up, barely restrained himself from smashing his cell phone, and ended up throwing the defective product at the wall before storming out and driving away without saying a word. I'm just sitting here thinking 'what the hell happened?' I would never act like that at all, but especially not in front of him.

It makes me wonder what he'll do if he ever gets that mad at me. And it reminds me of my psychotic brother who I've completely cut off contact with. (He has a long history of screaming in people's faces, throwing lamps, glasses, forks, etc. at them, kicking holes in doors, shoving people, and telling them to kill themselves. My last straw with him was when he picked me up out of my bed while I was sleeping and threw me on the floor.) 

How can I tell my boyfriend that his fits of ridiculous rage make me uncomfortable and less attracted to him? It might be an irrational fear, because he's never been violent with me, but I'm terrified of discussing this with him.
<bot>: boyfriend throws things around the room when he's mad, freaks me out because my older brother with a serious mental illness terrified me for years with the same behavior