How to get a fwb

So theres this guy & hes my friend & we've hooked up before & ever since then it's just random flirting & actually sometimes jealousy... Neither one of us wants a real relationship right now (even though sometimes he says "i mean if it just happens it happens") & he let out some feelings for me in a convo... We just never are in the right place to talk so how should i go about talking to him about us being friends with benefits? (Since unofficially we are basically)