Am I asking too much from my fwb?

I 24F got into a FWB with a close friend of mine 27M a year ago. We had been friends for about 5 years before we decided to add “benefits” to our relationship. For context, we were good friends before this, we hung out and made plans with our friend group fairly often. Now, my problem is that I feel like he is treating me more like FB instead of a FWB. For example, he texts me on super short notice when he wants to hook up. And I usually reply fast to everyone, so I don’t really have a problem getting back to him. However, if I text him to see if he wants to meet up and its just not a day that works for him, he won’t even tell me “no” within a timely manner. My texts go ignored for days or weeks. I kind of want to talk to him to let him know that its ok if he doesn’t have time or something but that if he always expects a quick answer from me, then its only fair that I’m given the same courtesy in return. And that taking weeks to reply to someone is simply not okay. Mostly since I know he never does that to our other friends. If he respects their time, why not mine?

I don’t want to come off as needy or clingy but I think these are fairly reasonable things to bring up. FWB might be casual but it doesn’t mean that you can just ignore the other person or not have any consideration for their time. And the expectations he has from me are clearly different from the way he treats me in return. I would like some balance. He dictates when we talk, when we meet, where and how. I kinda feel like I’m at his beck and call but my own interests don’t really matter. He will text me to tell to go over to his place but whenever I text him first he just ignores me and doesn’t bother to even say he’s busy or anything. He will get back to me when he’s horny again and I’ll not even get an apology for being ignored for weeks.

I would like to ask what you guys think about this? I think this is only reasonable and fair but I want to know your opinions too

Edit: if you guys want to know why I put up with this for so long? Well, first because I didn’t want to ask more from a fwb that is reasonable. But it took me a long time to realize that what I’m asking for is probably not to be treated like a girlfriend but to be treated with respect. And also because I knew he was busy sometimes so I wanted to be understanding and tolerant at first. But his attitude didn’t really change when his circumstances did. Even when he wasn’t busy, he still would ignore me