I remember once one of his friends sent him a selfie right after she had just slept with someone. She was in bed naked but the covers were up and she was showing off to him that she had just slept with someone. He showed me and I got upset but he shrugged it off like he had done nothing wrong.
There were a number of concerning pictures this particular girl sent him, but also because he thought it was all fine.

Maybe thats why I question his females friends because of the exchanges they had and the fact he thought it was fine? Is he still having these exchanges but just not showing me anymore because he knows now I'll get upset? How is he retaliating when I'm not around?

I haven't heard from her in ages but I know she got a boyfriend so maybe that's why