Everyone knew it had to happen.
Harry had known it himself well since fourth year. So when it did happen, Harry wasn't jealous. When Ron and Hermione gotten together over the Christmas holidays, he wasn't bitter. It didn't really matter that they kept it a secret from him, because he was happy for them.
It was so meant to be. So right. To witness the tiny sounds they made when they snogged, late at night in the common room, when they thought nobody else was awake. Harry certainly wasn't awake, and he wasn't watching. He never listened for the sound of Ron sliding out of bed, only to follow with his invisibility cloak.
Anyone who saw Ron and Hermione would agree that they looked wonderful together. And independently. Ron, with his pale, freckled skin and long nose and his thin, muscular body. It went so well with Hermione's soft curves, her smooth skin and the line of her cheek. Harry studied none of these things himself, anyone who spent enough time with them would notice.
So on Christmas eve, at the feast, when Ron and Hermione confessed their relationship to Harry, he was nothing less than pleased. Congratulations, he had said.
Ron thought it would be brilliant to celebrate this with some butterbeer and various other goodies - nicked from the kitchen - in the Gryffindor common room. "Ginny would be there too," Hermione said, smiling. It was quite obvious Harry didn't notice how Hermione's eyes had sparkled with joy at the prospect. That certainly wasn't the reason he smiled and nodded back.
Both of the newly established couple was eager to make sure Harry wasn't uncomfortable at the idea of them together. And he wasn't. Not the least bit. As a matter of fact, when Ginny had found her under the mistletoe, Harry leaned right in and kissed her.
He wasn't thinking of anyone else at all.