FWB question

So my FWB is my room mate but we keep it secret. We act like a couple but we arent, so he is leaving to his country for a learning opptny im obviously pretty sad because I did fall for him but I'll manage also we havent really spoke about us and him leaving.  Thing is we were talking and he said the next guy your with youll have to ask him if he can do this and stupid things like that. What would you think that means ?
P.S. dont reply with " Ask him" I obviously would have, I am just looking for point of views ! Thanks