SO liking pictures.

Please don't comment about how this is dumb. I just want advice. I know it should be fine to like other people's pictures. People think it's just a like. But every time my SO likes another girls picture it bothers me? Any advice on how to get over it? I guess it started bothering me when he used to like pictures where girls were just half naked. And now it bothers me when he just likes regular selfies. I wasn't really ever insecure in my other relationships, but this one i do feel a little bit.