Need advice from those in married/long term relationships

I’ve been with my partner for 4 years and he has always had hot girls on his Instagram popular and he follows pages like “tik tok baddies” or fitness models. He says it’s not a big deal, that he loves me not them and he really does show me that. Idk it still bothers me that his social media has a bunch of hot girls who all look the same and nothing like me, sometimes it makes me feel insecure because I’m thinking I know I’m beautiful in my own way but maybe he would be happier if I looked like them. For those who have been in a long term relationships marriage how do you deal with this? Do you guys have moments like this? Is it normal for people in relationships to find others attractive but still be totally committed? I don’t really look at other guys like that because I personally don’t feel the need to look around because I love who I have. I have my moments but there not as frequent as my bf. I just don’t wanna fight about this or feel bad about myself sometimes because I want to marry him and I know that in order to do that this is one of the things I have to work on. Please help me