Boyfriend was looking at other girls.

So I want to start off by saying he wasn’t just casually looking at other girls, I have caught him a couple times looking at certain hashtags and certain pages on social media that only post videos of girls like shaking their ass, he has some girls on Snapchat that post basically nudes, and in general about 90% of the people he has on his Snapchat are just girlS. I don’t necessarily have an issue with him having girls on his social media but it’s the fact that I know he does it because of the type of stuff they post. For example, one girl that I know he had on there, would post pictures of her boobs all the time and videos of herself, damn near naked dancing in front of the camera, and it’s not like he is subscribed to these people they are equally added on each other’s stuff so there’s fully an opportunity for communication. Now I’ve told him that I don’t care if he watches porn and looks at stuff like that but it’s just the fact that these are random girls who he basically goes looking for, like I don’t feel comfortable with him being on only fans because these are just regular people and I know people who have only fans so I told him that I would prefer if he didn’t use that and he still did. We have a one and a half-year-old and I’m also pregnant so I am not concerned with sending him I guess stuff like that? I mean I really couldn’t even get away with sending him nudes without my toddler seeing me or something. Well, when I asked him about it, being really unconfrontational, he basically told me that he looks at that stuff because I don’t give him the satisfaction that he gets from that. He didn’t use those exact words, but he said he looks at that stuff because it’s things that I don’t give him. So me going from being an extremely fit college athlete to now being pregnant with my second baby, my body has obviously changed a lot and it’s been difficult for me and him doing stuff like that just makes me feel worse… I don’t want to put me feeling insecure on him but he definitely doesn’t help it and I really wasn’t expecting him  to say that he looks at that stuff because it gives him some sort of satisfaction that I don’t like that kind of just was a punch in the gut for me. Am I over reacting about this? I mean I don’t go looking for men like that and I don’t sit here on my phone and scroll through guy after guy. Let alone I would never tell him that I’m getting something from random people on social media that I’m not getting froM him.