Left 18 month old alone

I nanny for a family on weekends, but I raise my 18 month old the rest of the time and am a stay at home mom. My husband has a normal 9-5 on weekdays and watches him on weekends. The mom let me go early today because they are having a family party. So I come home and my husbands car is nowhere to be seen, so I assumed he took our son to the park or something. Well I went inside and my son was wailing, had fallen out of his crib, and seemed like he had been left alone for several hours because he was filthy and then I checked my husbands location through his find my iPhone that he doesn't know I have the password to. My husband was at Buffalo Wild Wings and the psycho I am showed up there after I cleaned our son up and screamed at him for leaving Mica alone. He just said he was going out for a quick bite and needed a break, WHAT