Dispute or violence?
Most couples have occasional disputes. Between partners, you may become angry without this necessarily having negative consequences. Domestic violence is a different matter. Violence has a damaging effect on all family members. When there is violence, there is no longer respect for the other person and equality between partners.
Domestic violence takes place within couples, whether they are married or not. It can start developing at the beginning of a relationship, after living with each other for years, or while separating.