you're in Levi's squad and we can tell he likes you but he doesn't show any sign of it. At first he doesn't want to admit his feelings until it became stronger.

He'll go crazy if he lose you, he really likes you but you don't know it how will you know when he's not confessing his feelings? Right?

He was just silent and not showing any sign that he likes you

It hurts him because he knew when having a relationship or falling in love to a soldier is against the rules.