I don't purport to be a genius. I don't understand anything that happened in Matrix 2. I remember once in my Linear Algebra class, I totally zoned out when we started talking about Eigen values and I couldn't understand their purpose in my life.
I've always wanted to be one of those "beautiful mind" people who could write equations all around a room and it make sense. But alas I'm not.
I guess the main bullet point here is that I'm not the smartest guy on the planet. But I'm going to take a stab at answering your question anyway. I feel like I might be able to muster some sort of, credible response.
So here goes, maybe he talks to you about marriage and kids because he's possibly thinking of a future with you beyond waking up next to you in the morning for some ho-key pokey. I know it's a shot in the dark and it has a snowball's chance in hell of being right, but after all of the deep thought I put into it, that's the best I could do. I guess he really likes you or something. I know I wouldn't talk to a woman about marriage unless I was actually thinking of her in that capacity but I could be wrong. I'm not that bright remember.
Anyway, good luck with that. Do with my response what you will, and golly do I hope it has some relevance.