What does it mean when a guy talks about his "future wife"?

I have been dating my boyfriend for a few months now, and things are going pretty well. I am not sure where it is going, but things are good. Something that bothers me is when we are talking, he would refer about his "future wife". For example, he would say, "If I do have a wife, I would want her to decide when to have kids" or "When I would get married, I would want her to this", etc. Or sometimes he would say, "When you do get married, you should ask your husband to keep your last name"

I have gotten similar comments before with other guys I have dated, but usually it is said in a "we" form. For example, "I can see us getting married" or "I can see us having kids", which I realize sometimes is a case of love bombing.

Because my boyfriend talks about his "future wife" does that mean he doesn't see this relationship as a serious relationship? He sees marrying someone else? Am I just over thinking, because it does make me feel upset, but I feel too embarrassed to ask.
What does it mean when a guy talks about his "future wife"?
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