Adam's birthday party ended on a happy note, with Adam realising that he has feelings for his childhood friend Alice.
Even though Adam realised his feelings for Alice, he was afraid of confessing his love for her because he didn't know about her feelings; he felt that she only saw him as a friend. Also, he has doubts that Alice might have feelings for Mark.
At school, Adam heard Mark talking with his friends about how he was going to confess his feelings to Alice and write a love letter. After listening to this, Adam got jealous. So he started to follow Mark and saw that he left a letter on Alice's desk, and when Mark left, Adam went towards Alice's desk and took the letter in his hand. That's when Alice called him from the back.
Adam, Adam, what are you doing? In front of my desk, Adam got scared, put the letter in his mouth, and started chewing it. Then he looked back towards Alice, and When Alice asked what you were eating, Adam didn't say anything, ran from there, and didn't look back once.
Alice got puzzled by Adam's weird behaviour.