What is the name of the ex your spouse, or significant other has discussed suing based on past abusive behavior?

Before separating, my husband told me his ex girlfriend, Heather was ruining his life with messages through his Facebook instant messenger. He was upset and told me that she threw a plate at his head in anger during a past fight, before he met me. He said she would still contact him and bully him over shared debt for a new car they purchased years before he met me. My husband would disappear after having emotional breakdowns over this ex of his. He and I had our own share of unresolved issues, surrounding our children, but his ex would do something that would cause him to leave our residence and not return for days.