Does Shin not realize how much Wolfgang love him? I mean... After all those love making se...

He's a worrier he worries about the littlest thing to much to realize

Shin was taken away from his family at a young age to submit to the previous king’s perversity. He’s smart, but I bet some of the doctrines they taught there wiggled their way into his head so even now he could never imagine to be loved more than a mere bedwarmer. To make it worse, Wolfgang’s inexperience makes him oblivious to all the tumors Shin is carrying inside him.