Jorginho played 43 games last season in a season where Chelsea reached the FA Cup final, the Champion's League final, and the Euro's final. That is pretty much maximising a season in terms of available games.
Would you say he played too much last season? I would say no. That averages less than a game per week over the course of a year. You could make it 43 weeks with 7 weeks holiday, which is way beyond a normal jobs holidays.
Last season, he had no injuries, so every game missed was due to squad management. In the end, managers have a choice of who to play and when. A lot of the time they do not use it.
Jorginho had the potential to play in 78 games: Chelsea (59 games) and Italy (19 games). Management chose to only play him 43 times overall, and 6 of those were sub appearances.