No one is saying it's normal here? Accidents do happen due to illness/food poisoning/some other reason.

From your post I don't see anything that indicates that the guy is just being nice and is no longer interested in communicating with you. I would say the opposite... if he messaged you those things it seems like he wants to be supportive and is not scared off. Did you leave something out that indicated he isn't coming back?

Maybe you are projecting these feelings onto him since your grandpa pushed you away so you assume he would do the same. Seems like you are in a difficult headspace right now and need to take some to for yourself to figure things out. Seems like the guy is understanding of this so you haven't fucked anything up. Take the time you need, but you can still talk to him and just take it slow.