Shinjiro... really can't stand to look at you. Or hear you talk.
It's a harsh thought, but it's the truth. He's okay with your presence. More than okay, really. But as soon as you come into his line of sight, as soon as you speak, it just angers him, to an almost irrational extent.
He doesn't say anything, but he does look at the people you talk to with jealousy. They can be normal, they don't have to deal with their heart racing in their chest, and then breaking when they remember they're not supposed to be thinking about you so much.
Especially if they're a girl. He knows he shouldn't glare, but it's hard to be around you whenever you talk to, or talk about a girl. Even if you don't love them, just the possibility of there being a 'her' that you care about more than him bothers him.
He doesn't say anything. He can't say anything. It'd be unnecessary. It's your life, and he has nothing to do with it. Nothing to do with you.
But he can't stop himself sometimes. Like, right now. He can't stop himself from letting out a frustrated and tired groan as soon as the topic of the current conversation you're having with him switches to some girl you're friends with.
He expects you to notice. You always do. And you always say something about it. He's got a long list of excuses ready for why he doesn't want to hear you talk about her. Hopefully, you'll accept them this time, like you always do.