I know that it's probably really tough for you right now, but I do think you ought to break things off with him, because I honestly think that staying with him isn't going help anything. And if youo break up with him, if he still cares - it'll be a wake up call to him, and if he doesn't - you'll know and it might help speed up the moving on process.
and some quotes from "He's Just Not Into You"
"But what I can do is paint a picture of what you'll never see when you're with a guy who's really into you: You'll never see you staring maniacally at your phone, willing it to ring. You'll never see you ruining an evening with friends because you're calling for your messages every fifteen seconds. You'll never see you hating yourself for calling him when you know you shouldn't have. What you will see is you being treated so well that no phone antics will be necessary. You'll be too busy being adored."
"meeting someone you like and dating him is supposed to make you feel better, not worse"
Best of luck!
*the choice may have been mistaken, but choosing was not*