The past predicts the future

The girl's momma has a bad habit and history if you will of picking boy friends that are losers. I can not say what number she is on since the breakup of my son and her. Some of them have been very short, others have been longer. She has currently been involved with a young man for ?a few weeks? Nice polite courteous when we met him. Open about his past when I discussed it with him just recently. The past is not good at all, Just out of prison in Feb for drug related gun and robbery charge after serving 5 years. He says he wants to turn his life around. Has a new job to start on Monday. HOWEVER, I tried to tell her that it was too soon to get involved with someone since she was still in recovery and that if her facility had encouraged the relationship, I thought they were off base. He did advise her not to move into the rent subsidized apartment she had found, and did find her a nice little house to rent in a neighborhood, but he also was invited in, as to live there. Way too soon in the relationship, but true to form. He was helping with finances and did not have a vehicle so it was helping on both sides.
ADDENDUM: It seems that boy friend came home high - she said on weed- but it didn't matter what it was, that he wasn't coming in and she wasn't having anything more to do with him, that she could not put him or his actions ahead of her recovery and her children. It seems he left and got drunk and went to a friend or relative's house (I can't keep up) and "messed with" a 12 year old girl. I don't know how much messing with was done, but he is now in jail. His grandmother came to B's house and supposedly told her that if she had let him come home, he wouldn't have gotten in trouble, so of course the whole family is screwed up.
The point being that it is too soon for her to make these kind of decisions and she is making the wrong decisions when it comes to men, and she brings them into her house to live too soon. This is not good for her and certainly not good for her children. Now the next time she sees her daughter, she will have to come up with some excuse as to why he is gone.