You can only be dragged back into shouldering an old burden or responsibility if you allow yourself to be. You know you've gone above and beyond the call of duty, but that won't keep a certain someone from making you feel guilty about not having done enough. The truth is we all have limitations, and the sooner you accept yours, the sooner you'll realize that you fulfilled your obligation to the best of your ability. This puts you in a headspace where you can finally take yourself off the hook. Do this, and no one will ever have the power to manipulate you again.