It's not okay to betray your friends.
Jake and Earl made a pact many years ago not to date each other's exes.
Earl has a crush on Jake's ex-girlfriend and wants to ask her out.
Earl tells Jake about his feelings and asks to renegotiate their agreement.
Earl goes behind Jake's back and start's dating his ex-girlfriend secretly.
Jake sees that Earl is sincere and decides to drop the pact they made when they were young.
Jake feels betrayed when he finds out and ends the friendship.