It's not that you should never love something so much that it can control you. It's that you need to love something that much so that you can never be controlled. It's not a weakness. It's your best strength.
Monsters of Men - Patrick Ness.
Kill it! Shut it down! Lock him out! Give him nothing! You can string him along for years! You’ve had years together and what do you do?! You waste it!