[Shirou's just smiling when she says that. He just wants to protect her more than anything else! Who cares about ideals man... He doesn't. It's okay to be selfish just for this. Shirou just gives Sakura a clumsy hug he's injured ok. It's the most awkward hug he's given her, but he's doing all of this for her sake.]

No, I've made up my mind. Archer's helping me train. He told me it was necessary to hide it from both you and Tohsaka. I didn't mean to keep it from you.