<human>: Provide a brief overview of the text.

I have a pretty big submissive side and have been exploring this more and more with a dominant guy FWB over the last 5 months. He enjoys pushing my limits and, although I don't doubt he would happily and respectfully back down if I told him I was unable or unwilling to fulfill a command, I find myself going further and further down the rabbit hole and agreeing to increasingly extreme activities. I'm worried that i'm going too far and yet I find myself completely unable to say no when it comes down to an explicit "yes or no" question as to whether i'm in for something. How do I limit myself more?
<bot>: I'm unable to say no to my FWB and i'm worrying myself. How do I give myself more limits?