Relationship

So my boyfriend has this online friend that is a girl, and he games with her all the time and I’m cool with it like she’s super nice and whatever, they’ve been friends for a long time. I have a guy friend that I game with as well so I didnt assume anything at first or at all. But we’ve been dating over a year now and we have each others phone passwords etc. so to sum it up I was looking at their messages and I don’t really look through his phone like ever but when I do it’s sus as fuckkkk girls like idk. I trust him but all messages between girls on snap are never saved and I read the messages with him and this girl. So they were talking about gaming and he said “yeah but we’re waiting on you’re small delicious ass” and I asked him about and he said that it was an inside joke and that him and his best friends say that to her too. And it was kinda just dropped after that because I’m not like the confronting type. But I’ve just been feeling uneasy about it especially bc he’ll come home from work and game with her then we sleep. And there was one other time where I was pissed because they were playing D&D it’s actually called dungeons and dragons and you basically can be anyone that you want and you all go on a quest and role play as any character that you make up. And I can’t play with them because my work schedule sucks so I hang with him after work and I was listening the one day and she was calling him daddy and doing this little girl act type shit and I told him no like no. I feel uncomfortable. Like I do not like that and he told her to stop but idk. She puts on this cute little quiet girl act and ooo so kawaii omg UwU and idk I don’t trust it. And it could be trauma from past relationships but he’s already lied to me about a female when we first started dating. I just don’t know how to feel or think and I had to get this off my chest.