should I unfriend

I’ve had a FWB for 10 months

Lately I noticed, he, instead of texting daily he was starting to text every other day

Now? I haven’t heard from him in 4 days which is very unusual

Even on his busiest days or days he was on vacation or whatever I’d still hear from him

He’s active on Facebook he’s posting, liking my content

I can’t reach out it’s a rule he reaches out first

But from what I’m gathering I’m taking it as he’s not interested so I’m just debating if I unfriend him on Facebook as it seems he’s done or would that be too dramatic?

Idk what do you do in this situation?