Watching porn

Hello, my bf Caught me watching porn by myself.... he got upset ...i dont feel i did anything wrong....we didn’t talk when it happened instead we went out and returned late....i was asleep when he called his ex and had a 20 minute conversation with her....he did it out of spite...should i be upset or just let it go....i feel that the moment to speak past about the porn issue Has past and instead of trying to fix the problem he made it worst what should i do?