Lying about porn?

Tarryn • Ranch raised & Jesus saved❤️ Charolais Rancher 🐮 Proud Conservative 🤷🏻‍♀️ Mama to two beautiful girls💜💛
How do you feel about your SO watching porn and lying about it? I looked through my SO's browser history and I found TONS AND TONS of porn. I confronted him about it and he lied right to my face about it and denied it. It makes me so mad. Should I be mad or is it nothing?