My shoes keep ripping on the inside

Hi. As title suggests, my running shoes keep ripping on the inside part, both left and right. Last one lasted 1 month (150km), which is just insane considering, they were ~100€. What can be the cause? Last two years, when I was running only on flat roads, it wasnt happening and I was able to use one pair several months. But since late summer, I also started trailrunning. My feet is bigger size (46-46,5) and pretty wide and Im also not the lightest (190cm, 90kg). So, are there shoes that will last at least few months, in range 100-150€. And is there way to repair those and use them at least for slower/recovery runs?