Oh man I feel this in my bones. I was the same way for years, replying to stuff at 11pm from my phone while my wife just stared at me. The worst part was people started treating me like a help desk, like I was just sitting there waiting for their next thing. I remember one guy emailed me three times in one hour about something that could've waited till Monday. What finally clicked for me was when I started putting "I check email at 9am and 3pm" in my signature, and honestly it felt rude at first but after a couple weeks everybody just... adjusted? A few people still poke at me but I let those sit and they figure it out. My actual work got way better too since I wasn't always switching tasks. Wish somebody had told me this years ago.

Man, good for you for walking out, that guy was straight up stealing from you and you don't owe him a thing. I bounced from a bar gig once when the manager dipped into our jar for "register shortages" and two other servers quit over it too, so you're not alone in this.