Boyfriend's porn-- should I ask him if he's still watching? (After he told me he'd stop?)

Reem
So my boyfriend is a very sexual person. He used to have a porn blog with pictures of his... assets with unsettling captions (like "Come to bed with me"), but he didn't remove the pictures/delete his account. One night, a mutual friend showed a lot of our other friends the pictures. Even though this in itself didn't make me that uncomfortable, I didn't like the idea of my beau's dick being all out there on the Internet for anyone to see. I told him how it made me feel, and he deleted his account.
I realized that my boyfriend, like most men, likely watched porn. I absolutely hated this idea-- the idea that he must be watching porn on a regular basis made me feel sick. We had a long conversation about it, and I told him that I was not alright with him watching porn. He took a few days to think about it, and told me that he'd "avoid using visuala when masturbating."
I'm worried that he may still be watching porn, even though I don't actually have proof. I just find it so difficult to believe that he would stop. I don't want to discuss whether or not porn is okay here--I want to know whether or not I should ask him if he's been watching porn (after he said he wouldn't) or not

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