Am I wrong for being mad he watches porn?

Ok so i caught my bf watching porn, I'm really insecure about myself now, like after having a baby and a gaining a few pound i don't have that confidence i once had. He said he would stop the first i walked in on him right after i came home from the hospital with our new born child, now she is 6 months & he is still at it? We had a big fight, he says im over reacting. Am i wrong for being mad at him for watching porn?