My boyfriend chats with girls online on his videogame

I never thought I would write for help but I am so upset right now. I know that my boyfriend plays video games way to much and I like to respect his space and what he enjoys doing, but this morning I found out some chats he maintains with girls on the video games, some of them ask him to go and visit their Adult page and other girl told him “I really enjoyed our game”. I told him that now I understand why he is so invested in that game console and he just laughed and made fun of me all way to work. I am so upset and want to cry so hard, I feel that he is cheating of me, I mean, he can add those girls to other social media that he has and he could easily maintain calls with them. 😞