Being on-call can be rough on a relationship. My dad is a doctor and though he generally worked normal hours, I think he rotated on-call responsibilities for off-hours. So back in the days of pagers, he’d be at something like a school play or sports match and would get a page and need to leave early. I remember after one of these nights, my mom told me not to marry a doctor. That was the only real insight I got into that aspect of their relationship, but it didn’t sound great.