I don't want children...

I turned 30 today and my boyfriend and I have been together for almost 4 years. We got together fully aware that the other did not want children and we planned to spend the rest of our lives together without ever having any. This is a decision that we had already made even before ever meeting each other. However, we recently have been under a lot of pressure from family and relatives to reproduce and after thinking about it for a long time, I still came to the same decision. On the other hand, he seems to be considering the option-he says he is 10% certain that he may want kids. His father died several months ago and I think that is one of the factors that has led to this uncertainty. I don't blame him for it but I can't cooperate with him if he decides to go that route. We recently had this talk and I told him that women don't have the luxury of being uncertain since fertility greatly reduces once one is 30+. He said that we could still be together and he would bear a child with a younger woman if he became certain of wanting children. I suggested that maybe we could adopt an older child and he said that he would never raise someone else's child. At this point, I am wondering whether I should continue this relationship. Should I err on the side of caution and end it before I dedicate years of my life to him only to regret if he decides that he really must have children?