hmm if you have started feeling that there is no emotional bond, just speak to him and clear the air. don't worry. even if he is not there, you will manage to live an amazing life because each one of us are self dependent . Nature and god never designed us to be dependent on others.

I know that you know that you have to let go but something is also holding you back right? You'll also have the choice to continue until you get tired enough to end the relationship. It really depends on you. It'll hurt either way. Just do what you think is best and always remember that what you are about to do is for your own good. You know what, I've also been there. I chose to leave because it was affecting my appetite, mental health, and my studies. It's been a year but it still hurts and I still find myself going back to him and the memories we once shared. Anyway, good luck with your decision and I hope it'll be something you will never regret.