Ordinarily, the indisputable proof is preceded by a long period of suspicion.

The faithless one neglects his hearth.

A change takes place in his daily habits.

Various hints reveal to the outraged wife the trace of a rival, which woman's jealousy distinguishes with a scent as certain as that of a dog which finds a stranger in the house.

And, finally, although there is in the transition from doubt to certainty a laceration of the heart, it is at least the laceration of a heart prepared.