Am I overreacting ?

My boyfriend is an admitted porn addict. I honestly don’t know if he is, I know he watches it, follows women on instagram, etc. I have told him multiple times I don’t care if he watches it, I just don’t want to know when or see who/what he’s watching. Over and over again he’ll show me pictures of women he follows on Instagram flaunting their big boobs. I have told him multiple times I don’t want to see it because it doesn’t make me feel good about myself. Again, don’t care if he looks, I don’t want to know though. The other day he reposted a video of a woman with big boobs on his Instagram and I saw it and called him out on it. She was fully clothed, lots of cleavage, but it was obvious he’s following her bc of her boobs. I am very upset about this and I told him I was done with the relationship. All of his friends and family that I know and have met are also friends of his on Instagram and sees what he posts. I feel like it’s disrespectful to me.

After I called him out he was initially apologetic, but then called me back and was angry asking me why I was scrolling through his Instagram and telling me I should block and unfollow him if I don’t like what he posts. That if I don’t like something, I shouldn’t look at it. I didn’t go to his page, he’s my only friend that posts anything on Instagram and it was the first post that pulled up on my feed this morning when I opened it up.

Do I have a right to be upset or am I overreacting?