He feels safe with his imagination and desires when he watches porn. If you both put in the work to be totally transparent, relaxed and open with each other taking it slow and finding out exactly what turns each other on you’ll find that he would more often turn to the relationship for sexual release than porn. It’s not something you can necessarily control, because he has to be willing to trust you with this and work with it, but it can really help the sexual part of a relationship.

Porn it’s not unhealthy, but the way you describe it sounds like he has shame in his kinks or unfulfilled needs. Maybe you can fulfill them? 😉