You reconnected with your son LAST Thursday (the 11th) and you thought he would actually pack up everything and leave his senior year to live with a person with whom he's had NO contact for the past 4 years (except for the past 4 days)? Really? That's not how relationships work. And there's no magical mother/child bond that's unbreakable. He may have said yes to your offer as a knee jerk reaction to the situation he's in. After thinking it through, he may have decided that 10 more months (from now until graduation) may not be so bad. If his father and stepmom influenced him then he's old enough to see them for what they are. If he's in danger, he can report that danger to a teacher or school counselor. Or as Waylon said, he's old enough that he can live wherever he wants to. He's not an 8 year old who can't work or make his own decisions. What's the distance between the two of you (besides 4 years)? A few miles or a few states?