why is he so stuck up?

a few months ago my boy friend asked me to take a decision which badly affected both our lives but it was the least damage possible at that time. now on everything i do or say he brings up that subject but says hes over it for my sake...
he keeps on saying that he accepted the decision for my sake but i had never forced him into anything it was his own free will to accept it....
also if he did do it for me is it right for him to acclaim it over and over again????
i never make him count the things i do for him ..... is that why he never realizes them??????/
what do i do ,,,hes very special to me and i dont wanna lose him...i always did and will want whats best for him.....