There is an anecdote that does its rounds in the motivational speaker circuit about how you can boil a frog in water without it ever struggling as long as you increase the temperature of the water slowly enough. The analogy is that as humans we need to be more aware of our surroundings and be careful not to be lulled into a downward spiral of disaster.
Perhaps ironically, the anecdote is completely untrue and has been proven, repeatedly, to be the substance of myth… The ironic part being that we as highly evolved humans tend to be a lot more inclined to being lulled into disaster while our environment falls apart around us. This can be held true in matters of the ecological environment and love.
Frogs on the other hand tend to jump out of the water as soon as they get hot.
Funny what a frog can teach you!
(References abound, but one of the more eloquent ones is at http://www.uga.edu/srel/ecoview11-18-02.htm)