It seems to me that you made a wise decision at that time, to wait at least a year until you would marry him.

Regarding grief: it is a very individual process. He might be grieving in a different way than you expect, or he might be even ignoring the grieving process now. Does it really matter how he deals with it...as long as you take care of yourself and you don’t force yourself into 'getting over it'. Give yourself the time you need to process this.