You don't grieve because of what you said. You grieve because you miss them and you don't know when you will see them. I know it is selfish but its true. I attended a funeral once where the son of the deceased was a friend and "We are sad not because we would no longer see him, but because we do not know when.", Of course he maybe lying but sometimes we can take these people's statements at face value. Some people are short sighted, they are saddened inspite of their belief that they would be reunited and what they term the other side/life would be a far far better place. They are saddened because their lives have to change , maybe not for the better.