My boyfriends liking pictures of girls in bikinis

My boyfriend doesn't like pictures on Instagram a lot, but when he does its either a picture of something to do with surfing or a girl with a bikini. I'm fine if he has friends that are girls and If he like their pics. I have guy friends and I like their pics sometimes, but I also limit myself. One day I confronted him about liking a picture and he said that it was just a picture, but he also apologized. Now he's doing it again. He also has a picture on his wall of a model wearing a bra and panties. He's always calling girls hot when he's around me. I guess he's trying to make me jealous. I don't want to break up with him but this makes me feel like he's really shady and also kinda makes me mad. I don't know what to do. Any help??