Why do my earbuds keep breaking?

I love audiobooks and podcasts. I listen to them all the time, on my way to work, at home, while shopping. I love in-ear earbuds, because they feel noise isolating but they also are not bulky. But I go through a gigantic number of earbuds. I buy and subsequently break a pair roughly once a month. The way they almost all break is that one ear stops working. At first I thought it was the brand I was using, Skullcandy, which isn’t known for being durable. But I switched brands to Sony and the problem persisted. I’m not super-gentle with my headphones, but I try to be careful—I don’t step on them or let them get tangled or anything. What am I doing wrong? Are there indestructible earphones out there for people like me?