Why cant we discuss the expectations ?

I (f39)met a guy (m38) on an app that said he was just looking for something casual, someone to hangout with, chat, have fun, and potentially if things aligned be physical with. We talked for 3 days kinda all day , flirty ,fun, asking abt me, good banyering back and forth and he was putting effort in the conversations. He asked if i was interested in this fwb potentially situation. I said i would have to meet him because vibe and attraction are big for me in those situations, im not just sleeping with someone to sleep with anyone, like if its weird i wouldn't. He agreed and we set up a date to meet. Got dinner, vibed very well, both very attracted to each other, and ended up going to my place after. When he left he said he would text when he got home, which he did. We both said we had a great time and a few complimwnts were given on both sides. And called it a night.

The next day i just shot him.a message that he could come over again if he would like, just to let him know i was okay with the arrangement and to have a fun day. He replied with sounds good have a good day too. It just seeemed very short and standoffish compared to the 3 days and the night prior. So the next day i did ask of he would like to do something again sometime ? He said he would hangout with me again. I said okay to just let me know. Even though i would have loved to lay some ground rules so we were both on the same page.

I admittedly was riding the high of the meeting and such and just sent a fun message about something we joked about the next day and showed him a hangout spot i had mentioned i go to on our date. Overthinking im sure, but just making conversation i guess i felt chatty. The days after our hookup his messages were short statements thats all. And my last reply he didn't even read. I probably came off a little eager beaver i understand, but why can't adults who are fine swapping fluids just have conversations ? Honestly when i asked Sunday if he would like to do sometjibg again and he said he would, it would have been nice to have a conversation as to the particulars of the arrangement.

Why does it seem the guy always gets to be the one who says when and reaches out about it in the fwb situation ? Shouldn't i be able to ask him as well ? Not saying its happening because im sure he thinks im an avsolute nut now and dont get fwb, but itd be nice to kinda know and have both on the same page expectation wise so one person isn't feeling like the used party. I see posts all the time about having conversations with these situations but he seemed so closed off i didn't think it wise.

I do have to say ive been in these before , 1 with a much younger guy and when i tokd him we could meet up again, he said okay that he liked it and we continued weekly to meet up, and i cpuld ask as well, if it worked it did if it didn't it didn't, we had no convo but i kinda just flowed that way. With this im kinda at a loss.