I have a friend with very occasional benefits. We've known each four years, probably spent two of them in various levels of intamacy between other gf/bfs.
Anyway, Wed night, after a few weeks of not seeing or contacting him he texts out of the blue. All ver nice friendly, chatty across several hours. Anyway, as they always do, texts slowly became sexts, which is usually fine, usually I enjoy them! 
But there was something different this time, somehow more aggressive, nasty. I felt as if I was being humiliated in a way. It's really difficult to put my finger on why though. As I was uncomfortable, I brought it to a premature end, it was quite late.
The following morning I was still feeling iffy so stupidly texted to ask if he meant to be mean. Not sure what I expected him to answer! He was unlikely to say yes!
His reply was basically if I felt that way then we should stop all such interaction, I think suggesting we could carry on with the friends part of the deal.
Now, and this is the real point, I feel really guilty about even suggesting that he'd want to deliberately hurt me in that way. He has been a great friend over the years, helped me thru the aftermath of separation from H, which happened before I met him.
Part of me wants to apologise profusely, not just to save a usually very pleasant diversion! But also cos I think he's hurt that I should think that of him. But the other part of me feels it's ok to keep those boundaries and I should say sorry for them.
So wwyd?