One year? That's pretty good by my standards. I suffer a crotch blowout roughly every 3 months or so. Jeans, apparently, are not made for people with thighs, nor for people who enjoy sitting cross legged. And certainly not both.
As a guy with lifter's legs, I can recommend American Eagle's flex line jeans, whatever they're currently called by their branding department. They come in a wide range of sizes so you can easily match what you need, and also different fits. I used to have the problem you described and no longer do.