There is a reconciliation article going up, so this is the time to say this stuff. ;)
There is no love spell that will counteract you acting like an asshole to your intended. If you truly think that you can treat someone terribly then get them back and continue with that mistreatment that sent them away in the first place, the only person you're fooling is yourself. You will need to alter the behaviors that caused the split in the first place. If you being pushy, demanding, smothering, etc sent that person away to begin with, then when they come back, if you continue to act in such a fashion, don't expect them to stick around.