Well, assuming he has not been dissapointed by not finding his ideal version of himself inside your subconcious, you just need a plan like everyone else. But if he already made up his mind about what he suspects you think of him deep down, well.. its going to be rough, it would take a lot to break that defense down.
"can we try again?" is to confrontational in my opinion, dont put him in a spot where he feels he has to make an important decision. I would advice you try a more indirect approach, like telling him how you want him in your life regardless of ranks, labels, or any strict relationship status.
Once you are 'in' the relationship again, whatever form that is, you should find a way to dismantle his self imposed visualization that he is not good enough for you, which would be the real challenge, because you cant do it conciously, it has to be real.
Ok, it feels like im writing a movie script now.. hah. Just read it as that, i am the last person to be giving out relationship advice, and i know i am being over theorizing this way too much. Bottom line: just tell your subconcious to treat his subconcious as equals, or it wont work, or better yet, tell your subconcious his subconcious IS equal, and it will become equally functional.
Really, dont make much of my post, its just my angle, and we are entirely different people. Good luck.