He got upset at Darlene when she was going away to Chicago for college and was jealous of her because she got in and he didn't. He even picked a fight with her right as she was about to leave and tried to guilt trip her into staying in Lanford saying "you're leaving the guy you lost your virginity to!". Then he refused to drive her to the school forcing her to get a ride from someone else. He'd also flirt with other girls when she wasn't around.