My boyfriend always says I'll be his wife/mother of his children?

My boyfriend and I are only 17 (almost 18) but we've been together since we were 15. We're long distance (not too far though) and a day hasn't gone by where we haven't talked. I love him to death and I still get butterflies whenever I talk to him, even after all this time. But for the past few months, he'll always make these little comments shyly about (so quietly that I have to ask him to repeat it sometimes, and then he'll be like oh nevermind) how he thinks I'm the one for him and that I'll be his wife one day. He even talks about kids sometimes and a few days ago we were talking about parents who call eachother mom/dad to their kids and today when we were saying goodbye on the phone he said I love you mom... (Like not jokingly at all). Does he actually mean this? I know that obviously no one could know for sure but do guys normally stay stuff like this even if they don't mean it? I would be pretty happy if he actually did, I've never felt this way about anyone else😊