Stood up against my boyfriend's friends, but now I'm scared.

Some of my boyfriend's friends opend a group chat on Instagram. And because I have his id and I saw that group, but till then he was not aware of the group chat, cause he rarely checks insta. Then I checked their messages, they were literally sending n*des of girls, and similar stuffs found on Instagram. So basically, my bf's best friend was also there, so I clicked some screenshots of their chats and sent it to his girlfriend, I know he is cooked now, even I; myself scolded him so badly, he left the group. Then, some of the boys in the group tagged my boyfriend and asked about his sister, and told to set her with him. I replied saying how dare you to stay this all? She's the loveliest person in our home, (she's his cousin) think thrice before saying anything like this again. Then the guy said, why? I was saying this in a good sense, you always think negative, I said yes I think negative, and I'm not him, I'm his blah blah and don't add him in the group chats like this. I don't want him to watch these stuffs, I bet what kind of fathers y'all gonna be in future. Then that guy said, that whatever I said didn't make any sense. I stopped replying, another guy came and told that guy to come on WhatsApp group, and said that they didn't know a girl is handling a guy's profile.

  My heartbeat got too fast! I thought maybe my boyfriend wouldn't support me, and he would never talk to me again. But shockingly he supported me, he said he will do something tomorrow, he even said that I have done the right thing, and he left the gc. But, I'm scared because I have seen their messages, I'm thinking maybe they're talking about me now, maybe someday they will do something to me! I'm actually so scared now. I don't know what to do!!