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At the end of the day, it's your son's life, and for whatever reason, he seems to want some level of involvement with her or else he would have never accepted her back into his life. Apparently they have some kind of attraction to each other because she left, according to you, primarily because he was unwilling to commit. So the fact that she's back in the picture says to me that it's something they both want. I would encourage him to encourage her to make a decision; either she wants the boyfriend or she wants your son. I would also encourage him to figure out what he wants. As a woman, I know that majority of us bond a lot faster with someone when a physical relationship is introduced. Men on the other hand seem to be able to sleep with various women with no strings attached. I would make sure that he understands this. Make it clear to him that while it may just be sex for him, it may be more for her, and to continue to have any relationship with her could be destructive and harmful to them both, specially if he's still unwilling or unable to commit. He needs to tread carefully though.