Doing something you wish you didn't have to

I have an ex girlfriend I started dating the last month of my high school senior year we dated for three months until her mother found out I wasn't a christian which is one of the worse thing in the world to her though she doesn't know her daughter is a wiccan, but tonight when trying to have a nice conversation with my ex, she brings up how she had to get stitches because the guy she is dating now ,which I know to be someone much worse than I could ever be, threw her into his truck where an open knife was and it cut her, she said that she just laughed at it because she had been smoking pot and then she went and got stitches which she is hiding from her parents, I tried to tell her not to smoke pot or drink because it could lead to bad things, her argument was that shes seventeen and this is the only time she has to drink and party. in short I couldn't convince her to stop her idiocy, so I sent her mother an email telling her about what her daughter may be doing and to please stop her before she hurts herself badly. have I done the right thing because I feel like absolute shit now, and for those of you who support marijuana I have nothing against you but this is a seventeen year old girl, who I do dearly love though I know now she may forever hate me

and I'm sorry if this doesn't belong here but I just need someone's opinion.

Mod Note: Moved to the Love, Romance and Relationship section.

Sorry for the inconvenience caused.

Getting back on topic, it appears that you want the best for your ex-girlfriend, which is why you informed her parents about her behaviour. At the same time, I cannot help but feel that you wish to get back with her. Could you be worried that your actions may have selfish motives included?

At the end of the day, we can only advise others on certain issues. Ultimately, the decision lies with them.

your instincts and intention on this point were in a good place, but I'm not certain about your delivery. It's true, you've successfully alienated your ex, by essentially delivering her to her mother who also does not seem particularly reasonable. That's the problem. You may have pitched her to the wrong person for help, thereby only hurting her and driving her further away/to escape.

What Gambler said was correct, "At the end of the day, we can only advise others on certain issues. Ultimately, the decision lies with them." Now, this doesn't mean enabling her or letting her ruin her life but this isn't about you saving her. This is about her finding herself, and sorry to say but on the list of things a 17 year old could be doing, marijuana and alcohol are not too high up on the list of things to be concerned about. Maybe it's a release, judging from the one sentence you put in about her seemingly strict mother, maybe she's trying to lash out or find her grounds and herself on her own terms, at that point a better tactic would be to help her find a more palatable escape or form of expression. Focus on improvement through a positive rather then a negative. Instead of cracking down and throwing her to the wolves, you could've helped her build herself up. Moot point now, she knows you are untrustworthy.

But she should probably get rid of the douchey new boyfriend.

I thank you for your advice and yes I did at some point maybe want to get back with her and I also know that this has driven her away from me, but this morning I received a message back from her mother telling me that she is not dating anyone and has not been out of the house with anyone except her father who she stays with on weekends so my ex may have been lying, but my attempt was a failure anyway. I won't trouble her anymore though because I know she probably hates me either way.

But again thank you for your advice and gambler I am so sorry I put this in the wrong section, I didn't see the love, romance, and relationships section