Changed his mind about TTC

My boyfriend has wanted a baby with me for a whole year now. One of the reasons was he's 31 soon and all of his friends are settling down and he felt he was running out of time. He knew I wanted one too but I wanted to wait until I got a new job and was engaged or married. He kept on about it, excited and mentioning "our child will look like this", "we shall call him/her ____", etc. Last week we had a row and when I brought it up he said he changed his mind and thinks we should just enjoy the time we have together for a while. I don't know what happened and he's denying saying he wanted to try for a baby this year, or that he 'can't remember' ever saying it or dropping hints. Any ideas why he might have changed his mind suddenly? :/