Breakup Troubles!

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So I just got out of a relationship of about a year. The girl being my best friend before that for a year. When we first met we hooked up a few times then she somewhat fizzled out. This was a girl when the first time I saw her AI thought she was amazing. She was everything I wanted in a woman. Successful, beautiful, from the same area as me, and it turns out our parents knew each other in high school.
So this fizzled out after about a month but I still wasn't over it. I kept my distance for awhile and we ended up becoming very close friends. But deep down I knew I wanted to be more. After awhile we became closer and closer and eventually started dating. It really never felt like she was 100% into it by some of the things she would like, like call previous guys she used to date all the time. I would catch her in lies about what she was doing. But during this time we were getting closer and closer. I eventually fell in love with her.
During this time she developed a nice little drug problem.
Putting me in situations where we would have to go meet with her drug dealer, spend our whole night looking for drugs, and eventually lying to me and telling me she wasn't on it when it was evident she was.
Every time I would call her out on some of her lies she would flip it on me, get angry and make me feel like I'm trying to control her.
Recently I had enough and told her I can't deal with the drugs and the lies anymore. So in return she started hanging out with one of her other guy friends non stop who accepts her doing what she is doing.
Im close with her family and she is with mine. It kills me to let this go
I love this girl. She means more to me than anyone. I know I can't change her and I need to walk away. I just sent her an email telling her all of this. Bad move?
Im going crazy about this and can't get her out of my head because I know how she gets when she's messed up.

I also started dating another girl recently. She's very cute but I'm not over this other girl. I feel bad but its just comfortable and I almost know for sure its not going to work because I'm still stuck on the first.

What the hell do I do??

I had a very similar situation with my exboyfriend. I wanted to take our relationship to the next level but he was to involved with drugs. Everything revolved around it and the people and his life style quickly turned to things I didn't want to be with. I was very close with his family (his mother was my guardian and I lived with them)

I thought I loved him but when I saw that he needed more help then I could give (plus he didn't want to listen) I had to pull the plug. I took more of a drastic approach, packed all my things and left while he was at work. It was the easiest way for me to leave, and if I didn't do it that way I probably would have been talked into staying.

It has been a little over 4 years since the day I left and I still think about him occasionally. He was my first love and I won't ever forget him. But now I am having the time of my life, I am HAPPILY married, and have a beautiful little girl. All in which I probably wouldn't have unless I left.

You need to be strong for yourself and just let go. Sometimes people with drug problems need to hit rock bottom and realize what they lost before they can get back up. Its called "Tough Love"