Husbands addiction

So I just found out that my husband has been watching porn. He seriously has an addiction. He will watch it at work. In the middle of the day. At night. I understand that people watch it and it’s whatever. But for me it breaks my heart. How can someone who supposedly “loves you” sit there and lust over another woman. I don’t understand and I don’t know what to do. It bothers me SO MUCH. I need some advice?