If you're in a situation where you like a person in an abusive relationship, then most likely the person seems to be reluctant to get out of their relationship. The person most likely has self-worth issues. Until those self-worth issues are resolved, the person will never be happy with you or anyone else. Most often they feel that they don't deserve to be happy. Until that person feels that they deserve happiness, and want happiness with you, you can forget ever moving beyond the friend zone. All you can do is be supportive. Try to raise the person's self-esteem and hope for the best.