My Partner loves watching porn

Today caught my partner was masturbating on a porn clip while I was downstairs for few minutes this morning. I was so shocked, as we hadn’t seen each other for a week ( we each have our own place) I couldn’t believe first thing in the morning he’d preferred to masturbate with porn clip. We’ve always have good sex life, although I know he always watch porn and has been a habit for many years, but i had never caught him doing it in front of me. Especially while we are together just for the weekend, very disappointed, now I don’t think this relationship is meaningful anymore. I can’t hide the feeling of been betrayed.