Don’t know what to do

There’s this girl that my boyfriend is friends with and I told him how it makes me uncomfortable. They went on a date once before and she cheats on her boyfriend and my bf knows that. Also, we all go to the same school and he’s never introduced me to this girl. I see them walking together and when they get to me they go their separate ways but she just gives me a look...

They play imessage games all the time (something my bf and I use to do at the beginning of our relationship)

I can’t comprehend the reason that he continues to stay friends with her and I try to ignore it but it really bothers me and I’m starting to have dreams about it. He continuously defends her whenever we have a conversation about the situation and idgi.

A couple nights ago I had a dream that this girl and I got into a screaming match over my bf and it really bothered me. I am the opposite of a violent person and it really took me by surprise.

I just woke up from a dream where I was yelling to my parents bc he was going to an event with just her that seemed like a date in my dream.

Should I tell him about my dreams?