You had to kill one of fatui, Childe. You became friends with him, and soon fell in love with him, but you still had to kill him. While he was distracted by something, you decided to get out a gun, and when he turned around and saw a gun, he smiled and said he love you.

You pull the trigger by shooting him in the shoulder, unable to kill him. He took hold of his shoulder and fell to the floor, leaning on a tree and chuckled.

"I love you.. so much.." he whispered looking down.