How do I deal with boyfriend/roommate problems?

I have read your letter and am shocked that you are still living with the two of them. You have one of two choices, either you get rid of her or you go yourself. Telling your boyfriend to get rid of her I would imagine will not work, as he should have seen this a long way off. I am surprised that he has continued to carry on with her knowing that you are upset with the situation. I think that if you could talk to him without any interference from her , you might make him see sense.If you feel this would not work out then leave the two of them to their own devices and get on with your own life.