A more optimistic view might be, that the user could use the tool to help deal with their feelings and questions and lack of closure in a way that doesn’t involve the ex or other people.
Once they’ve had their fill of ranting or stages of grief and reached catharsis, or they’ve figured out their own feelings and views, the model and all data could be destroyed and no humans would have been harmed in the process.
A suitably smart program might work as a disposable therapist of a sort. But that’s probably quite far away from current models.