private stories

so this one guy who just graduated (i’m gonna be a senior) just added me on snap randomly (by quick add). we had a class together my junior year and he knew i didn’t like him (only because he was irritating during the class. i had no relationship with him other than that class). it was kinda weird that he added me in the first place but then today he added me to his private story and mind you, we’ve NEVER talked before other than in that class. i thought it was weird. what do you guys think this means? (if it even means anything i might just be overthinking it lmao) also i have a bf and he knows that so i’m confused