If you have a relationship that feels bad. It is bad. Pay attention to how you feel. Don't get caught up in how much you'll miss him. Remove yourself & you'll be surprised by how much happiness is on the other side!
It hurts like hell. You want the relationship back the way it used to be... It will never be that again, don't delude yourself into believing otherwise. Don't give up your self respect and dignity trying to get it back. Stay strong and move forward.