Don't let your spouse sweet-talk you with remorseful begging and promises that it will never happen again. Talk to someone about the problem. You are probably having some very old and self-defeating conversations about being abused. As long as you stay committed to those conversations, change is not likely to occur. Abused spouses need to develop new conversations about themselves.
Family violence is often a well-kept secret.
A professional family therapist who is trained in family violence can help. If you keep the abuse silent and secret, it will continue and it will get worse. It has been my experience that when a perpetrator of spouse abuse actually makes it to therapy, court-ordered or voluntarily, he will stop the abuse by simply being told to do so. Once the abuse is public knowledge, it often stops then and there. Shelters for battered spouses can provide information about local groups.