Tsundere: "I-idiot!"

Crying: "You finally said it to me..."

Smiling: "I love you too..."

Stunned: ".........Huh?"

Panic: "W-wait!! What are you saying all of a sudden!?"

No Reaction: "Ah, right." (Congratulations, I envy you...)

Expressions and responses when being told "I love him/her!"