You could have just told her things weren’t “working out”. You could have done so many other things but no, you decided the worst route of them all. Breaking her heart came awfully easy for you… Don’t you think?
To make her miserable and make her have to deal with you not loving her was a heartless game… Dude, she loved you. If you didn’t love her anymore it would have been much easier if you had just left. Or you know, maybe said you didn’t love her anymore?
You literally dragged her through the dirt until she was going insane over it. How can you treat someone you used to love like that?