Red!

I like him, but I'm not going to tell him. I do want to get to know him, though. I don't think I'm good for his happiness, so I'm leaving home.

I like him and I take care of him, but I've given up on him ever understanding.

Green is actually called Blue in English, right?

What?

His response is blunt. He doesn't really try to get to know him much, but if something happens that makes it obvious, he'll think "oh, I guess I like him". That's just how it goes.

He looks bored, and he's quiet around Green. Even though Green's feelings are portrayed clearly, he doesn't get it. He disappears, and comes back, and then he's gone again.

(But they stick together in the future, in Alola.)