What is the best way to move on when you know your crush is taken ?

Oh btw my crush doesnt even know my existence. I met him once during this one camp last year,but I managed to track him back through Instagram. Cant even describe how happy I was at that time. Few days after that,he posted one instastory,showing he was travelling with his bestfriend,and I spotted there were 2 other girls joining the trip. And turned out to be both girls are studying in the same university with him. And this one girl,who joined the trip,seems to always post my crush's pictures. It is like where my crush is,there she is. They are like sticking together all the time so that is why I think they have something going on.

And finally,heartbreak walks in. Time for me to move on. It hurts tho.