I do not know if I should stay out of this or get involved. Our son is 18 and has been dating a girl for over a year. They have been on and off again even before that. We have never liked her or trusted her but have kept our mouth shut except to make sure that he keeps his priorities straight about his future, like college, etc. She has broken up with him twice in the past and it has always been because of another guy. He has taken her back each time. She is a very needy person. She has a family where this type of thing goes on with the other kids and the family tries to ignore it and keep it under wraps. She tries to manipulate every moment of his life(if we let her). She complains that she does not get to see him enough. She has few, if any, other friends. She lies and then talks her way out of things. A few days ago, she was caught sneaking out of her room to meet another boy - and had been doing so for some time. Our son was devasted but now she is back bugging him and trying to make excuses for what she did. I thought he would finally realize that she definitely has problems and get out of this terrible relationship. He is going off to college, anyway, next year. If she can't stand it now, it will be worse when he goes away and will definitely do this to him again. He is not saying much but I can see that he is being sucked back in to her lies. I know he is old enough to make his own mistakes, but I feel that his inability to see her for what she is is a fault that could get him a lot of trouble and feel like we should intervene and maybe get him to a counselor. I don't want to make things worse but I also don't want to let him go back to such a destructive relstionship. What do you think? When do you intervene as a parent?