Roy did have repressed anger that he was compelled to release, which usually occurs when something sets him off. Like most outcasts who become homicidal, he is powerless in his life, unable to get what he wants, and turns to violence as a way to gain some sort of power over his environment as all power at its most basic form is derived from physical violence.
With the girl at the end, there is another angle. She was a spiritual person who believed in positive energy, and thought that "the world is beautiful". This is the polar opposite of Roy, who is sees nothing in his future except working the drill press at the factory for the rest of his life, only to come home and watch TV while drinking beer (like his father in the beginning). Roy's response to her is "*beep* the world". The girl tells him something along the lines of "you have very negative energy, and that is going to prevent you from getting anywhere in life", and this affects Roy as it has a lot of truth to it. This ties in with a running theme in the film where Bo and Roy are "losers" who are outcasts, unable to make friends, get girls, or achieve anything other than working a menial job.
When Roy sees that Bo is getting it on with the girl, this makes him feel even more ostracized and alone than he did previously, as he no longer even has his friend by his side to make his misery more tolerable. When he attacks her as she is having sex with Bo, the song "I Got Nothin'" by Iggy Pop plays in the background, which directly applies to Roy's mindset. Roy has nothing in his life, and never will, and he resorts to violence to destroy what others have, just like when he shoots the girl Bo likes in the car.
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