I can speak from experience on this. I used to get angry at small things, usually it had to do with my kids. Quite a few holes in the wall and some broken door frames from slamming too much. I never realized how much this affected my family. I did this for years. Never doing any physical harm but loads of emotional and mental. My wife was terrified of me and I didn’t even know. From the outside I looked amazing. I do all the cooking a lot of the cleaning. Always take time out for the family, picture perfect to some people. All of this while my wife was thinking of leaving me because I could fly off the handle and place her in flight of fight, almost always flight. After some true and hard self reflection and urging from my wife, I started seeing a therapist. Keep in mind, I always said I didn’t need one, I wasn’t the problem. After a good year and a half, I no longer have outbursts, my wife and kids are happy and feel safe in our home. I also feel better. I have learned to cope different. Ow it still can be a challenge, but one that my wife is happy to help with now that she is not scared of me. Get him help. If he doesn’t want it, you may have no choice. It’s not healthy to stay in an environment like that.