I don't know what to do

So this happened with me recently when one of my guy friend(been friends with him for almost 5+ years now) sent me a very dirty text one night expecting me to revert to that in the same way. But I texted him 'sent to the wrong person' cuz I know he got a gf but for my text he replied ' No, I didn't'. I was shook bcz he did the same thing again and asked him why he would do that. Turns out his girlfriend isn't sexting or meeting him due to some of her personal issues and since he knows my past and I have been in casual relationships,he thought sexting with me is okay. For which I said ' No, it's not okay.' And now our friendship stands at a weird point where I can't talk to him normally bcz I know wht he thinks of me but he is trying to have normal conversations bcz he thinks I am cool with wht happened... 🙂 I don't know wht to do