My grandpa passed a few hours ago

I don't really know why I'm posting this, but I guess it's just to share something. He apparently fell last night, and only shared it with his therapist this morning, not wanting my dad to know. The therapist told him anyway (rightly so, I believe). I went to check up on him at lunchtime, since my dad is out of town and my grandpa wasn't picking up any calls, and he seemed fine, watching TV, although he was in pain. He didn't tell me, but I could notice it. His brother was supposed to check up on him this evening. He wasn't picking up any calls this time too, but since it had already happened, I figured it could've been fine and it was just because of his mood or so. Unfortunately, when I went to his house, I found him passed away, thankfully in his bed. Right now I weirdly feel very calm, like I should be more in grief. At the same time I'm thinking I should've been more decisive and not worried about his opinion and called an ambulance when I checked up on him earlier today, though rationally I know I could've never predicted it to end like this. That's all.