Porn addiction?

So my husband and I have been married for 3 years this year and we just had our first baby 7 months ago.. and I just found out he has a porn addiction. He’s in the military and last year was deployed for majority of my pregnancy. And he’s leaving again soon.. at first I told him that watching porn didn’t bother me because I do it too, until I found out that he has an actual addiction to it. We’re both 22. I kept asking him if it has anything to do with me and he says no, that he’s been addicted to it since he was like 13 years old. And at this point it’s just habit. Like we’ll have sex and he said if I go to sleep then he’ll go to the bathroom and jerk off to porn & he does it at least once a week. And he said sometimes he’ll watch it at work and stuff too. But what bothers me the most is that his friends will send him pictures of girls he went to college with or highschool with and he’ll text back saying “I wanted to fuck her so bad” or “big boobs 👀” ect. Like he’s lusting over females he knows too with his friends.. is this normal? Am I over thinking it? I only watch porn if he’s deployed or if he’s not available to please me/not at the house. It just makes me upset that he watches porn while Im home and so often. If Im wrong then Im wrong and appreciate any criticism. I just want to know if Im over thinking this or not??