Why Is My Boss Nice One Day and Mean the Next?

Monday he praises your work in front of the team. Wednesday he tears apart the same project. Friday he’s warm again, almost apologetic, and you find yourself thinking: maybe we turned the corner.

Then next week, the spear flies again — and it hurts double, because your shield was down.

If that whiplash sounds familiar, I want to give you three things: the name of the pattern, the reason it hooks you, and the rule that protects you. Because the hardest part of a hot-and-cold boss isn’t the mean days. It’s what the nice days do to your judgment.

The Pattern Has a Name: The Pendulum

Here’s the first thing to understand, and it will lift a weight off you: the swings are not caused by anything you did.

You’ve probably been auditing yourself — replaying Tuesday to figure out what triggered Wednesday. Stop. A boss whose treatment of you cycles between warmth and hostility is almost always running on internal weather: his insecurity, his pressures, his moods, his standing with his own bosses. You just happen to be standing where it rains.

Scripture gives us the original case study. King Saul cycled with terrible regularity on David — spear, remorse, warmth, spear. Twice he wept over David, called him righteous, swore the hostility was over (1 Samuel 24 and 26). Both times, the pendulum swung back and the hunt resumed. David’s conduct never changed. The weather did.

Why the Good Days Hook You

Here’s the cruel mechanics of it: unpredictable rewards bond people harder than consistent ones. It’s the same principle that keeps people at slot machines — the random payout keeps hope alive, hope keeps you invested, and investment keeps you exposed.

Every warm day whispers the same message: see, the real boss is back — the mean days are the exception. So you lower your guard, share a little more, hope a little harder. And when the cold returns, you don’t conclude the pattern is the pattern. You conclude you did something to break the good streak — and the self-audit starts again.

Read that loop carefully, because it’s doing more damage than any single bad day: it keeps you permanently uncertain, permanently hopeful, and permanently focused on managing him instead of protecting you.

The Hard Truth About the Warm Phase

Here’s the part that took me years to accept, across more than one difficult leader: the warmth is usually genuine — and it still changes nothing.

Saul’s tears were real. The remorse of a tormented man in his clear moment is sincere. You’re not being fooled by an act; you’re being fooled by weather — mistaking a sunny afternoon for a change in climate. The kindness on Friday doesn’t cancel the pattern. The pattern includes Friday.

The Rule That Protects You

One sentence. Write it down: Enjoy the warm phase. Never bank it.

Accept the good day graciously — be pleasant, do great work, take the win. But don’t use it to relitigate the past. Don’t extract promises. Don’t share confidences you’ll regret in the cold phase. Don’t stop keeping your private record of incidents and dates just because this week felt better. The single most expensive mistake people make with a pendulum boss is treating the warm phase as the real person and the spears as aberrations. Judge the climate, not today’s weather — and the climate is written in your log, not in his Friday smile.

Practically: keep your documentation running in every phase, keep confirmation emails routine (“Confirming our conversation: X, due Y”), keep your ambitions and job search entirely out of his reach, and keep your support system outside the building strong. Stability has to come from your side of the relationship, because it will never come from his.

When to Take It More Seriously

If the swings started after your successes — the promotion, the praise from above, the visible win — the pendulum may be part of a bigger pattern: an insecure boss who experiences your excellence as a threat. That’s a different diagnosis with a fuller playbook. And if the cold phases are escalating into write-ups, exclusion, or campaigns against your reputation, treat the situation as strategic, not emotional: document, protect your visibility beyond him, and keep your options alive.

Go Deeper

The pendulum is one piece of a complete pattern I break down in my book — the psychology of the insecure leader, the seven disguised weapons, and the full survival playbook drawn from the man who dodged a king’s spears for years without losing himself: The Spirit of Saul: Surviving the Boss Who Wants to See You Fall.

Stop auditing yourself for causing his weather. Start keeping the climate record. And enjoy the sunny days — with your shield within reach.

Commissioner William Epps is an author and security leadership consultant. His books are published through E.P.P.S Method Publishing Co.