post-breakup awfulness

My partner broke it off with me on the 20th. it was pretty out of the blue. he just dropped my stuff off, cited that he 'needs his head in the game' to finish out his course and get a new job. (understandable) I didn't really get the chance to process when he last spoke to me, so its been 6 days of guessing, speculating, ruminating about why he couldn't just ask for space instead of breaking up. I find myself CONSTANTLY checking his old tinder profile, his Instagram, and checking my phone for a text or call from him. I've been good and not tried to seek reassurance from him. i haven't called or texted, but by doing the opposite action very hard, i might be missing something. im second guessing a lot of my behavior. but mostly im just... miserable. joined NOCD because i wanted to work on my relationship OCD to bring a better version of myself to the relationship. now my worst fear happened...lol