(CNN) Anthony Scaramucci seems to have finally learned a very, very important lesson about President Donald Trump: If you stick around long enough, he will turn on you. Always.

"For the last 3 years I have fully supported this President," tweeted the former White House communications director about his onetime boss and longtime friend. "Recently he has said things that divide the country in a way that is unacceptable. So I didn't pass the 100% litmus test. Eventually he turns on everyone and soon it will be you and then the entire country."

"Eventually he turns on everyone."

That might seem like an exaggeration made by a disgruntled former friend. It's not. For a man whose life has been defined, in large part, by his open embrace of his inconsistencies and contradictions, one of the very few things Donald Trump has been consistent about is that he goes from love to loathing quickly. If you are close to him (unless you are a member of his immediate family) you are on the clock. It's only a matter of time before he tires of you -- and turns on you.

Consider these names (and this is far from a complete list): Michael Cohen, Omarosa Manigault Newman, Rex Tillerson, James Mattis, Jeff Sessions, Steve Bannon, John Kelly, Paul Ryan, Cliff Sims, Donald McGahn, Chris Christie and Scaramucci.

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