Lost the love of my life

This week has literally been the worst. My fiance died last Saturday in surgery after a bad car accident and no one even knew what happened to him til Monday when the hospital finally called his mother after she had been calling everywhere trying to find him.. I still can't believe they waited 2 days to get ahold of his family.. This week has been so hard for me and his family.. It's so hard to keep it together. I usually cry at night or when I'm alone. My life had just been getting better and my depression had slacked off a lot but now it's back full force and I'm miserable.. I have 3 kids who need me to be sane for them.. I've had loved ones pass but this pain is so different. I literally lost a piece of my heart 😭😭 How can I cope? Any advice is greatly appreciated..