This was after the war, at the hospital (chap. 424). Bakugo was more sweet with Deku and he was visiting him for the 2nd time at his room in the hospital

Deku🥦: In his bed, covered in bandages "Hey Kacchan"

Bakugo💥 : "Hey Izuku... I have a question..."

Deku🥦: "W-what is it?"

Bakugo💥: "Why do you still help me or follow me... A-after all I done to you... Why are you s-s-still..." Tears start to show up