SO and porn

Is it just me or there really an issue here? 
My husband has broke routine here lately ( coming to bed way after everyone else, carries his phone EVERYWHERE he goes; including the bathroom) things he use to not do. I got curious and started digging through our computer and pulled up a bunch of porn sites and pictures he has been looking at on his phone. He is also doing it while he is at work. I also found some webcam websites that he has accounts for but when I ask him about those he says he doesn't know what they are! I know he created them because of the passwords for them, they say his name all over them. (He is a log truck driver so he uses his handle for passwords). Am I just being paronoid is there really something to worry about? I don't mind watching it with him, but he says he watches it to get new ideas but yet he Jacksoff every time he watches, and what he watches I don't feel is appropriate for a grown man. Someone please help me figure this out. He says he will stop but I can't believe him because he has lied too many times over all this in the last couple days.