You ask him: "What do you mean" and then you be quiet and listen to his answer. If his answers is still not clear to you then you say: "sorry, I'm not getting what you mean."
Only he can tell you what he meant and anything you get here will just be guesses that may be "fun" to read but won't help you with knowing exactly what your bf meant.
Learn to communicate and don't be afraid to ask HIM what he means if he ever says anything you don't understand. That is how you have the best odds of having good, solid, happy relationships becoming good, solid, happy LIFEtime unions.
“The willingness to accept responsibility for one’s own life is the source from which self-respect springs.” ~Joan Didion