The way to help a person you love who is hurting you is to stay with them and try to convince them to stop hurting you or to be so good that they don't have a reason to hurt you. No matter how worried, jealous, or angry someone is, they have no right to hurt you. They have no right to use physical violence to express their feelings. Everyone has the right to be safe. If you or someone you know is being beaten, get help.
Nobody deserves to be abused.
By defending your right to be safe you're letting an abuser know you are serious about their need to change. Violence can help a relationship. Abuse is never a sign of love, even if the violence is followed by tender times of making up. Abuse is a sign that the abuser has problems and needs help. The only way to defend yourself if someone insults you is to threaten to beat them up.