So I've been going out with my girlfriend for about half an year now, and I've been getting to know more and more about her. I've been a bit uncomfortable with my girlfriend's past. Right before she went clean after meeting me, she used to smoke weed all day and pop e everyday and do other bad things. I've seen her change after meeting me. She stopped hanging out with friends that she used do all those drugs with and she's really changed for the better. Her best friend since childhood led her to all this and she broke apart from her but recently they got back together. She says she won't turn back to doing all those things again but she's been doing it for so long I'm afraid she might turn to it again. Is it normal to feel uncomfortable about what might happen since she got back with her friend? or if she'll turn back to those things even without her best friend?