Gastric Byp...Pulling Away From Family Members?

Hello. I am not the one who has had the surgery done. It is my aunt. We are all very proud of her for losing her weight. That is NOT the problem. She has this "new" boyfriend, and he is totally worthless for her. She has even said that in the beginning, that she wants someone to take care of her. He can not. He is an alcholic (she supports the habit), and he draws disability (although he does everything, hunts, cuts down trees, etc.) She does not spend any time with her family any more. The guy says he will not talk to anyone that is related to her sister, well that includes her kids. She will not give her youngest child any money to drive his truck, but she makes several trips a day to see him. The youngest child has even seen her give money to the bf to pay for his booze. She is losing her family. We do not know what to do. I have heard from someone else that has had the sugery done, that it can effect your mind...but I can not find anything on that. She does not come to see her four year old niece anymore. She spends all of her time with his family. She is not even herself. She buys him new shoes, clothes and etc. I think she has totally lost it. She is supposed to be on depression meds but she does not take those either. This guy has been married before and his exwife says this is what he does. He pulled the exwife away from her family and brainwashes you. My aunt can do so much better. She looks great, and could get someone who takes care of her. She already has two kids, she does not need a third. She does get child support, but she tells the kids she only gets 100 dollars when she gets 320. So, another lie. This 45 year old bf tried to pick on my kid brother after a high school baseball game, my brother would have won that match, but my Aunt had to step in and get them away from each other. The bf was bad mouthing her son and my brother stood up for him. My aunt stuck up for her bf saying that an 18 year old should not be picking on a 45 year old man....does that seem right to you. The bf almost walked out in front of my mom the other day, and she just about hit him. Then he tells my aunt that we almost ran him off the road, and she calls us asking why we did that? We have people coming up to us, asking us why she is with him and he is nothing but trash. We just tell them she is out of her mind, and she will not listen to us. Everyone will tell you that he is worthless. So, now she is losing her kids to him. She believes everything the BF says and pays no attention to them, calls them and hangs up on them, won't wave at them, barely even talks to them. When she has something to say, she is usually just yelling. She tells them that she does not have any money...although she can take off of work and go with him to different states, and do whatever but does not have money to give to HER kids. So has any one else had this problem. We were/are very supportive of her getting the surgery done...but the after affects really suck. She is NOT the same person mind set wise. HELP!!!!!!!!