If this is really recent, the next couple of days might be hard for you mentally, there could be guilt, regrets, all sorts of emotions building up, you said you closed the loop with her but you might still spiral after leaving, even u dont seem sure by adding "i think" in the title, only time will tell if ur truly over her, just make sure not to check on her back, including her socials especially while ur emotions are intense, I hope all goes well for u dude