Is this cheating ?

I was on my boyfriend‘s phone because my phone was almost dead and then I noticed that there was a girl called mama on this phone and I opened the chat to him replying to a post and saying gytaaaaa (she posted a bikini pic that just showed her ass btw) and then I scrolled up and saw he had conversations in June and July one of them was send me the video I wanna nut we went dating then but I think it’s interesting that is what he said but also that was the only thing saved. So i first said my friends boyfriend  swiped up on this girl post saying she’s hot and it’s like just showing her body and my friend thinks thats Weird do you think that that’s weird? Yeah that’s definitely weird. They have a toxic relationship? And I said no pretty healthy relationship and he was like oh well then yeah like that definitely like the stages of cheating and I was like right so it interesting u did the same. I told him when I saw him he just sat there like I’m sorry. So what’s your opinion he said he’s never met her and she doesn’t even live here but I just think it’s interesting and definitely a red flag.