[quote=@IncredibleBee]
[@AtomicNut]

How is he stuck in the Mortal Realm if he has easy access to a Hell Gate?
Also keep in mind Hell Gates are so hard to do, getting one open was the antagonist goal in DMC3 and DMC4.
[/quote]

He was stuck for a time because he took such a beating he was weakened/ lacked the resources to do one. He no longer is stuck, but decided pizza and videogames are far more amusing than acting like a demonic jerk.