I imagine emmett respects the fact that rosalie has never tasted human blood in her vampire life a lot. he even slightly envies her for that resistance. probably like he envies anyone in his family because he is the only really unstable one in their family. since even though it is jasper who is presented to bella as the dangerous one, as I mentioned in another headcanon post I actually believe that he has never had a ‘slip’. emmett however had several. several that go beyond the two singers he had killed.
&& that’s bothering him. while emmett is usually the carefree kind of person, this is actually very difficult for him to handle. due to different reason, first of all it is a burden for his whole family, they had to move several times for him & second of all it is a sign of weakness. it hurts his manliness, his EGO.
& will I believe that rosalie and emmett actually live a very ‘modern’ relationship; by which I mean that rosalie is not YOUR scared, shy, little thing who needs emmett’s constant protection. he lets her fight her own battles, knows that she can easily defend herself yet would aways back her up when necessary. be there if she needs. they don’t have this classic, old fashioned role allocation in my opinion.
HOWEVER, emmett still wants to be the ‘man’ in the relationship and those slip ups hurt that. it is very hard for him to confess his slips, to actually most people in the coven. carlisle because emmett admires him to death, esme because she reminds him of his mother and he hates disappointing her & rosalie well because he wants to be seen as the strong, invincible man by her. because confessing those slip ups means showing weakness. she has so ‘easily’ resisted the blood of her victims ( royce & his friends ) yet he is unable to do it.
she is still the first person he would go to. he trust her a lot and while it hurts his ego, he would also always seek out her help.