So me and my boyfriend have been together for about 2 months, we’d known each other for a long time before as friends. I’ve never been happier and we both make such an effort and we do love each other however his best mate has recently become single and sends pictures of attractive girls who I know to him and I have seen my boyfriend comment back with things no girlfriend would like to see... I feel too insecure to bring it up, how should I go about it because I wasn’t supposed to see the message in the first place