It has taken me 20 years of marriage and 2 years of therapy to be able to leave my husband. He is moving out later this month and we have started on the divorce process. Two books I found helpful:

The Verbally Abusive Relationship by Patricia Evans

No Visible Wounds: Identifying Non-physical Abuse of Women by their Men by Mary Susan

These books may help give you insights into why you are still in the abusive relationship.

Good luck. You deserve a happy life. A good therapist can really help.