AITA for laughing when my ex's wife complained to me?

Betrayal carved deep wounds in a family once bound by love, leaving a mother to navigate the shattered pieces of her heart and the fractured foundation of her children’s lives. Five years have passed since the man she trusted chose deceit over devotion, entwining himself with another woman who had already betrayed her own past, creating a tangled web of broken promises and stolen trust.

Amid the echoes of hurt and the sting of an uninvited stepmother’s presence, she stands resilient—grieving what was lost yet refusing to be defined by the betrayal. Her focus remains on shielding her three sons from the chaos, striving to rebuild their world with strength and grace, even as the shadows of infidelity cast long, painful memories over their fractured family.