FWB help

Ok so I’m new to all of this FWB thing.. it’s been going on for around 2 weeks. Should you speak to them every day? I mean I always have something to tell mine, I never just text saying how are you? It’s always to tell him or ask him something. But he ignored me all day yesterday after having sex all night the night before! It pisses me off because it’s just plain rude. I’m so scared I’m going to start getting feelings. Any tips on how not to 😅?