How am I supposed to feel?!

Let me start off by saying that I have no issue with my husband watching porn. I’ll watch it with him at times. But the other day I needed to make a call and couldn’t find my phone so I used his and when I went to close down the calling app on his phone and saw that he was looking at an APP called theChive and he has tons of half naked girls pulled up. Am I wrong to be pissed that he’s looking at other women? He seems to think it’s no big deal. I don’t care about porn because it’s just the act of sex to me but when he’s getting off to pictures of another girl that hurtful. Am I wrong to feel this way?