The Doctor felt as though his hearts might give out on him again at any moment. Was this how his other self had felt, standing on that beach and waiting for Rose to deliver her verdict when she had demanded to know how that dreadful last sentence between them their first time on Bad Wolf Bay had been supposed to end? The Doctor didn't fancy being in that place, so uncertain of their future, yet here he was, waiting for Rose to tell him if it were still possible that they might have something together.
"You have me, if you want me. I'm not leaving you again. I can't. It's the last thing I want to do." He didn't have the strength to do it anymore, either. Rose was right there. She was everything he wanted, and unless she told him to stay away, he would remain as close to her as he possibly could. He reached out to carefully tuck a lock of hair behind her ear, his fingers brushing lightly against her cheek.
"I've made you cry again, haven't I? I'm sorry. I'm so sorry. I didn't mean to. If it's too much, if you don't want this ... " He dropped his hand to his lap, more uncertain than ever. There was a faint tremor in that hand, born of weariness and anxiety. He pushed through the bone-deep pain that was paired with his fatigue and waited for Rose to make her decision.