I really like this quote, but I don't think this would truly take just one day. You'll have to fight for much longer, survive for much longer, persevere for much longer. And the truth is some of us won't get there. The world is too unforgiving for that. However, I do believe that even if we never reach a position where we can stop caring, friends and family will be the comfort you need.
Yeap. What it comes down to is your actions in the end. As the saying goes actions speak louder than words. We can make careful plans if needed to to end relationships we do not wish to stay in. Start making plans for the life you want to have after that person is no longer a part of your life. This will make you stronger. Feel the fear, but do it anyway--carefully and with the help of others. If you give up, nothing will change.