WTF ! ADVICE NEEDED!

My bf and I have been together for a while now and we have had our breaks but one break we had really got me upset.

Let’s say he’s talking about his friend too much so you start questioning it. Then you decide to go on a break so he can figure things out and you pretend to be all happy again just so he doesn’t feel bad about his actions. Later he starts talking to his friend he wouldn’t stop mentioning... that hurt so bad it was like I was right he would go to her. And we started talking again and he would tell me things and I would cry idk I probably shouldn’t have but I did.

Then we get together once again and I saw the messages , everything he said and sent . I didn’t know how to feel.. he was calling her names (according to him because she wanted someone to call her names) and talking about her body.

Then according to him she only did one thing to him.

Like before he would walk her home and try to get him to go inside and all that. He didn’t but rn I’m just all over the place.

Idk how to feel, we never finish this convo. So I’m just thinking if I should drop it and never finish having a talk with him about it. Or if I should try to bring it up once again.