Erza was a mage from the Fairy Tail Guild. You were her best friend, a sunny girl always ready to help. You cared the most about Erza. More than her boyfriend, Jellal, did.

One day, you were walking with Erza outside, talking about how excited you were for the party tomorrow ( the birthday of the Master! ), and you noticed someone kissing another person. You looked at Erza, and her eyes were wide open. She said, with a trembling voice.

"Jellal..."

You understood so quickly.