Controlling?

Hey friends! My boyfriend has been getting a lot of nudes of women from this guy he used to work with, the women are just pornstars but he always responds, nothing sounding like he’s into it and he’s told me before that he just has to acknowledge this man but it keeps going on. I’ve told him that it makes me uncomfortable but I don’t want to get controlling. I am starting to get self conscious tho. Just kinda want to hear what you all think, I’m not sure how I feel about it.