you most definitely did the right thing leaving him. I was in a long relationship, About 2 years in I realized I didn’t want the relationship as much as I should. i’d ask for space, meanwhile i’d be texting other guys, it was shitty, but I knew that if things didn’t work out with those guys my ex was right there waiting for me, sometimes I’d tell him when there was someone else, other times i’d just hide it. if I had no one at the time then that’s when i’d give him his time in my life, anytime I had someone new i’d ask for space “to think” but really I was just trying to find someone new but I didn’t want to be lonely while I was searching for that new person. Now I know that all sounds shitty & Im not proud of it. But you did the right choice, don’t be someone’s backup, he’ll only come back to you when he’s lonely and has no other girl on his phone. no matter how much you miss him or love him don’t talk to him again. maybe one day he’ll see how wrong he was but at the end it’s his loss.