Cancer sucks

My boyfriend of a year mom just passed away from cancer yesterday and I was shocked when he called to tell me this. I know there is nothing I can say or do but I was wondering if there was any advice anyone can give me on what to expect in the next few weeks. We don’t live together and I know He has his children and family to lean on and by no means do I expect to be his priority till he’s ready I just have never lost anyone myself or been through this so I feel so helpless. I have just been letting him know I love him and avoiding the typical condolences. That’s his mama and I am so heartbroken for him. I can not believe how fast all of this happened she had just gotten home from the hospital a week ago and I genuinely thought everything was going to be okay