Shirou Emiya
"No, I never knew that", he heard Rider say, at which point he rudely interrupted her, interjecting with a response of his own.
“No, of course you didn’t, and you know why? Because she hates bringing it up, she’s never told me why. The only reason I know is because I sleep in the same bed as her.” Shirou took a breath and continued. “She never tells anyone about her problems, she does her damndest to hide them and pretend everything’s ok!” Shirou grabbed Rider’s shoulder forcefully, a panicked look in his eyes. “If it’s bad enough for her to tell us, it’s something really really bad, Rider!”