It would be difficult for him to explain. Things like this don't happen to him. Whatever good will Bruce Wayne had in the universe was used up in the first eight years of his life; he had an idyllic, fairytale childhood, and then his life was severed into two parts, leaving nothing but his mission. His war. Someone treating him like this, speaking to him like this-- it happens in one of two situations. The first is he's hallucinating. (Too many times, magic or mind control or a hundred other things.) The second is there's a knife waiting behind the lie. (He loved Talia, despite it.) It's all manipulation and fantasy, except this is Clark. Bruce knows better than anyone just how honest and just how true all his goodness is; he is possibly the only wholly, honestly good person Bruce has ever known. He's not lying, he's not trying to hurt or manipulate him.

For someone like Bruce, it's a lot to process.

He settles, calm in the other man's arms.

Letting himself believe, if just for tonight.