They may not be on speaking terms

Usage examples of exes.

The tabloids had dug up several of Rupert's more bitter exes, who, having done a great deal more than kiss, were now only too happy to tell.

He's got two exes who skinned him financially because he couldn't keep it in his pants, and without Pepper, he probably wouldn't be able to get a meeting in his chosen field.

Burt Cowan’s exes listed sexual aberrations that included such bizarre practices that they might have come right out of Krafftebing’s study on aberrant sex.