Yeah i think so too...or we see a Samurai with realy troubled face
Maybe he rejects that because he saying he isn't ready to marry...until he can't complete his misson(completing his martial arts training) he can't be lazy. Or something like that. Perhaps he can say that he'll consider her offer and when the time comes he give a straight answer.
Something like that...i think it's a possible way for the outor to get out of that kind of problems...a "typical samurai" can speak like that.