@Roxanne Robinson,
What relationship? You didn't even know the mother of his child had died. That seems to be something that someone would talk about to their significant other, don't you think?
You had every right to ask the question and he has only himself to blame that you did so on a day he claims he was burying his child's mother since he never mentioned it to you. (Are you really certain he is telling you the truth?)
I think I would find someone in your own area and sever this current relationship if I were you.