He's just a typical failure, tries to act cold and distant all the time and skips on classes because it bores him.
Guess what, no one likes school, but it is needed, something he never understood.
Thus, he ends up with awful jobs in either end, electrician or (lol) garbage collector.
And that's not all. On Nagisa's route, even though he has a child to take care of, he goes on being an emo failure for a long time before suddenly turning around and "I love you my daughter who I abandoned with your grandparents long ago!"