long ago had a couple of FWB (not at the same time!)
They both worked and when I think back to why, it was for a few reasons. Referrign to both FWB:
We were friends with benefits. Not strangers with benefits. Not terribly deep friends, but we liked each other.
We both knew the relationship was really only friendship and not going anywhere further. No expectations. One relationship ended becuase I met someone I was serious about, the other ended because one of us moved way out of the area.
We were respectful of each other, both out of bed and in. And had fun togehter, both outside and in!
It sounds like yours started fun but is now giving you more uncertainty and insecurity than fun. He doesnt seem to be treating yo uwith respect, and tbh it sounds like you want more from him. Reading between the lines, it sounds like you're more wanting companionship, fun, sec and definitely affection - and you're not getting them from him.
It's not really working for you atm and becuse of that I think you should consider terminating this particular FWB.
Btw, if you embark on another FWB then something that is essential for success is to lay clear groundrules between you about future expectations - and if one of you says "I wont ever want more" take him at his word. Now and then things change in FWB situations and then the more serious partner has to say 'ok my feelings are changing from friendship to romantic"- but the partner also has to accept that the other person may not want more. In which case, the FWB situation will no longer be working and needs to end. Othewise it gets messy, messy, messy