There was a period when I was patient with customers, coworkers, waiters, and complete strangers, then came home and became irritated over tiny things my wife did.
One evening I heard myself speaking sharply to her because she asked a simple question. I suddenly realized I was giving the best version of myself to everyone except the person I claimed to love most. She never confronted me about it. I've worked hard to change since then, but I still feel ashamed that kindness became something I spent outside and withheld at home.