I (29f) have been having trouble feeling satisfied in the bedroom, and do not know how to make my husband (30m) understand what I want.

So, my husband and I have been together for about 5 years now, and we used to have very satisfying sex, however, lately things have been less than satisfying more often than not. The reasons boil down to the fact that he seems to be unable to fulfill my desires even when I ask him to and explain to him what I want. He doesn’t seem to understand. It leads to me having to sit there and imagine him saying the things I want him to say just to get off because he will not say them on his own. Unfortunately, he sort of caught me in the act of this today because I was being very quiet (due to how deep in thought I was) and asked me what was wrong. So I told him straight up. He just got silent after that and so I gave up trying to finish with him and went to the gym instead. The problem just seems to be getting worse and worse. It’s like there’s this wall between our understanding of each other that didn’t used to be there and I don’t know how to break it down. It is actually devastating me a bit as I type this. How do I get him to understand how I feel and what I want? I feel like I have explained as much as I can, but short of giving him a script to read off of, I’m not sure what to do? I’d hate to have to just tell him exactly what to say because that would ruin it, as the words would not be genuine under that circumstance.