you know him better than anybody. But I find it shocking to hear that he is talking about it all the time. So you, maybe he loves you like crazy and really does want to tie the knot. Good luck to the both of you. Just make sure that it is what you want for yourself.
Maybe your ex situation was just a coincidence but no guy is going to talk about marriage if they aren't thinking about it or is ready to propose...cause most guys wouldn't want the girl to start asking about marriage when they aren't ready for it so I think he is ready to propose