How to show interest in a guy you know without contacting them directly?

[Anonymous]

I actually used to be friends with benefits with this guy and I started missing him. How can I show subtle interest without straight up calling or messaging him?

[Avicenna]

You can't, unless you have someone else tell him

[theRen]

I agree. Depending on how long it's been, the sudden message will give him an immediate interest signal now you could play it off but the first impression is always there. If you really wanna, I'd say just go for it, no need to be subtle.