he unfollowed me on snapchat and insta?

I don't understand- I just wanted some incite 
I slept with  this guy when this organization went on A retreat . It was for three days and I slept with him once while giving him head a couple times. We spoke shortly after and then just recent he deleted me off Indy and snap chat. I don't mind that we don't talk but why do guys just take someone off ? That takes a concious effort
** AND he goes to my school and we are part of the same organization : I go to their events sometimes so we can bump into each other . 
Any insight would be great.