My friend likes torturing himself mentally at work. is it normal?

I don't understand it. At work he gets a 30 minute break by law but he never takes it. He complains about how he's mentally drained mid day but never takes his break.

He works 6 days a week but doesn't take any vacation days off the whole year, then complains about never having a vacation and wanting to see the world. Constantly says he's stressed.

He started volunteering on his Saturday off for 20 hours...0 pay, complains about how stressful it is and has broken down crying MANY times and continuously complains about how exhausted he is and said it's likely why he's depressed..

Mind you his job pays him $70k a year, his apartment is $900 a month because it's shared, he's 23 years old, he lives with a roommate who he never hung out with once who he describes as really friendly, he doesn't go anywhere other than to work or to volunteer or after work he goes to my place to have dinner.

He's been doing this for 3 years now.