Michael Sampson

Role in The Third Wheel
He is first shown on Greg's Relationship Chart list, showing he is dating Abigail and that Cherie Bellanger likes him. Before the dance, Michael said to Abigail he would not go to the dance because of family obligations. However, at 9.00 PM at the dance, he came with Cherie, causing Abigail to cry as he had cheated on her.

Role in Hard Luck
Michael got back together with Abigail after the yearbook photos. It is implied that the only reason Abigail went out with Rowley was to make Michael jealous after he cheated on her.

Trivia

 * It's unknown why he cheated on Abigail.

Appearances

 * Diary of a Wimpy Kid: The Third Wheel (First appearance)
 * Diary of a Wimpy Kid: Hard Luck