Seeing Harry back in the room made Ron wish for a moment that nothing had changed. He didn't like being without his friends so much. Not that Neville, Seamus and Dean weren't brilliant, but they weren't Harry. And when Ron woke up in the middle of the night, he couldn't roll over and see Harry there to make him feel better.
It sucked.
But what did Harry care, right? He wasn't around anymore. He had Teddy to look after and obviously that was more important that Ron. "I'm not," he insisted. "You're the one with a new life. Not me."