Throwaway account because too many of my friends know my usual account. So I saw something I shouldn’t have seen last night. My boyfriend has a close friend who is female and like a few times I’ve seen messages from her. I try not to look because I don’t want to be weird. But like one of the messages I saw was incredibly explicit. It was a joke. But it made me uncomfortable seeing it. There was also multiple missed calls from her on his phone. When he receives notifications from her he immediately deleted them. 
The thing last night was he accidentally sent me a picture of her that he had edited and then tried to cover it up by sending me other pictures.
To make matters worse it’s his ex. He’s best friends with his ex. It makes me super uncomfortable and I can’t mention it to him because I don’t want him to hate me or think I’m trying to control him. I can’t tell him to stop speaking to her because I don’t want to be that person.
I feel like they are both up to something. I feel awful to even doubt him. It’s her I don’t trust. It’s like she has some hold on him or he’s still emotionally involved with her and that’s killing me.
I have no idea where to even go from here, I can’t say anything to him. I can’t break up with him because I love him. I can’t do anything. 
The only thing I can do when I feel like this is stop speaking to him because I don’t want to say anything hurtful. This sucks so bad. I don’t want to be like this, I feel like I can’t even act like a normal person. 