Needing some advice

So I’m just in need of some advice/support! One of my husbands best friend (a really good friend of both of us) passed away tonight in a car accident. He was only 21. It’s hitting my husband prettt hard. We’re completely heartbroken. For any wife’s/girlfriends who have been through this with their spouse, how do I help him? How do I make sure he’s okay while also making sure I’m okay? Any advice is appreciated.