He loves you. He wouldn't want anything other than you. But as a butler to you, he couldn't confess as he thinks it only would be disrespectful to you

Whenever he's in his wolf or semi-wolf form, his tail wouldn't stop wagging in happiness everytime he's with you.

He can't help but feel jealous whenever you're with someone else, or talking about someone else even.

Just like now...

"My lady..." His tail wags a little as you talk about someone else with passion..