Hot personal trainer alert????!!

So there is this hot personal trainer in my gym.. idk his relationship status but guy like him probably has a missus.. i was in my gym 6 months ago but i left and reactivated my account anyways he is sooo attractive everytime we look each other we smile i notice that he only smiles at me even though he does group training with other girls 😩😩irgh idk what to do im 20 and he looks mid 25ish or so 😂i knw his name but nt last name man i stalked him lots on facebook but i couldnt find. What do i do.. i focus on my workout... but when he is around im weak.. he walked past front of me and look at me 😂and went to his office and when he was bout to shut the office door he look at me again :) in a way? What should i do.. should i do first move to talk or let our eyes do the talky? As in just wait for him to do first move 🌷🌷help a sis out! Anyone with similar situation? Co worker or gym?