Feeling terrible

So my son woke up and it’s dads night to get him as he does one night and morning for me. I had woke up but my son wasn’t crying just stirring so I figured he would go to sleep or my partner would get him. Well my partner didn’t get him and I swear my mind completely shut off and my son was apparently crying on and off for 10 minutes a family member said. I always wake up to it and tonight i didn’t but neither did my partner. My son was crying all alone for so long. Just one of those shitty feelings as a parent and I feel like a complete failure.