Is this excusable?

Alright so my bf has male friends.. that’s normal and all however when his friends girlfriends are around or he’s just trying to receive something from the females he’s messaging is it okay for him to take on a flirtatious manner in order to receive nudes from the female?

I understand how it sounds and believe me I’m still upset over it but he claims that’s how guys are. He didn’t mean anything of it. He was just trying to i guess “score” for his friends. Although I believe if he truly did not care for it he wouldn’t have done it..right?

I’ve told me him he basically cheated on me however he claims if I would have done it under the right circumstances he would be alright but I don’t believe that.

I’ve told him he’s wrong in all corners of how he sees it but tell me why I can’t let go of him.

In my mind I consider it cheating and how do I know that all the girls he messaged are for his friends. I found over thousands of girls pictures that he was “ too lazy to delete” but I mean how hard is it to even do that? I mean how does he justify having a saved conversation of him and a girl sexting each other? And saying that he fell in love with a brat (I.e me)

I’m not sure how to even process this....the way he explains it to me makes it seem believable but I don’t want to seem naive.