Resentment is the invoice for every boundary you never said out loud.

Souring toward somebody usually traces back to a limit you held privately and never stated. They kept doing the thing because nothing indicated they should not, and the charge accumulated on your side alone. What feels like their fault is often a bill they never saw.

When you notice resentment, look for the unsaid sentence underneath it. Say that sentence now, plainly and without the backlog attached to it. Stating a limit is easier than continuing to pay for one nobody knows about.