That's one thing I learned about ambivalent love addicts. Once a person becomes "within reach" they suddenly become "invisible" or unavailable. Afraid of getting near, they hide. They prefer to keep some distance.
I think true ambivalence is based on dislike of the person, but want/need of a relationship. Any relationship! When you embark on a relationship with someone you truly don't like, only for the sake of having a relationship, you constantly feel pulled in one direction and then another. Getting rid of ambivalence is about growing up and recognizing that it's important to date people with whom you really like, love and get along. All other relationships are pointless.