Rickey is shy and doesn't say much, this is shown by the music tone and the mid and close up camera shots. When people try to talk to him, he doesn't reply and just walks away. It's clear that he is not used to the country life.
After attempting to run away, Rickey finds himself passed out the next morning only a few hundred meters from the house. When Bella finds him, he has slightly more confidence. He even goes as far as trying to make conversation with unfriendly Hec.
On Rickey's birthday, he gains a significant amount of confidence and happiness towards both Bella and Hec. They give him a pet dog for his first ever birthday, this makes him very happy and excited but stays humble and thanks them both.
While Rickey is playing with his new dogs, 'Tupac', Hec is bawling his eyes out hunched over what seems to be Bella's body. This shifts his new happy characteristics to sad and lonely, seemingly something he has experienced in the past.
After injuring a sad funeral for Bella and an awkward night with Hec, Rickey decides to forget his past and burns down a shed