Without more information, it is hard to give any advice. If you are in an emotionally damaging relationship with a friend or boyfriend, cut off all communication. Don't speak to them, and don't go to the places they frequent. If it is a family member, that is a little more complicated.
If you want the person in your life, then you must ask yourself, "What am I getting out of this?". If you think it is emotionally damaging, yet you can't bear to cut off all communication, then there must be something beneficial you are deriving from the relationship.
I am not suggesting you broadcast all your private business, but if you provide more information, it might be easier for readers to make suggestions.