Sometimes you just have to step back, and step away from the details that are eating you up, to look at the big picture. That's when you see things clearly, and you get to think as the closest to being rational you could ever get (still not close enough though).
The thing is, often the big picture--and the decisions that need to made after seeing it--can be pretty painful to realize.
Still, it's your life, and it's your call. You choose your own happiness, and likewise choose the personal misery pit you will wallow in.
The only comfort is knowing that there's no rush to this decision.
And that you can always choose to curl up in the comfort of things you've gotten so used to, instead of facing the proverbially harsh winds of change.
(Often, being brazen is not being brave. Sometimes it takes a lot more courage to be what others see as a coward--if it means that at least one person is spared the damage.)
No one will ever need to know that you almost changed your mind.